================================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D
                                 (Rule 13d-101)
                               (Amendment No. 23)


             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)


                              The Korea Fund, Inc.
                              --------------------
                                (Name of Issuer)


                     Common Stock, par value $.01 per share
                     --------------------------------------
                         (Title of Class of Securities)


                                    500634100
                                 --------------
                                 (CUSIP Number)


                                 Barry M. Olliff
            c/o City of London Investment Management Company Limited
                     10 Eastcheap, London EC3M ILX, England
                                +44 207 711 0771
           -----------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)


                                December 31, 2007
             -------------------------------------------------------
             (Date of Event Which Requires Filing of This Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(e), (f) or (g), check the following box / /.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 or otherwise subject to the liabilities of that section of the Act but
shall be subject to all other provisions of the Act.

================================================================================

===================                                                  ===========
CUSIP NO. 500634100                     13D                          PAGE 2 of 6
===================                                                  ===========
================================================================================
     1       NAME OF REPORTING PERSONS
             S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

             City of London Investment Group PLC, a company incorporated under
             the laws of England and Wales.
------------ -------------------------------------------------------------------
     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP            (A) |_|
                                                                         (B) |_|
------------ -------------------------------------------------------------------
     3       SEC USE ONLY

------------ -------------------------------------------------------------------
     4       SOURCE OF FUNDS*

             OO
------------ -------------------------------------------------------------------
     5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
             TO ITEM 2(D) OR 2(E)
                                                                             |_|
------------ -------------------------------------------------------------------
     6       CITIZENSHIP OR PLACE OF ORGANIZATION

             England and Wales
--------------------------------------------------------------------------------

      NUMBER OF           7    SOLE VOTING POWER
        SHARES                 3,638,394
     BENEFICIALLY       ------ -------------------------------------------------
       OWNED BY           8    SHARED VOTING POWER
         EACH
      REPORTING                0
        PERSON          ------ -------------------------------------------------
         WITH             9    SOLE DISPOSITIVE POWER

                               3,638,394
                        ------ -------------------------------------------------
                         10    SHARED DISPOSITIVE POWER

                               0
------------ -------------------------------------------------------------------
    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

             3,638,394
------------ -------------------------------------------------------------------
    12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
             SHARES
                                                                             |_|
------------ -------------------------------------------------------------------
    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

             12.68%
------------ -------------------------------------------------------------------
    14       TYPE OF REPORTING PERSON*

             HC
================================================================================

===================                                                  ===========
CUSIP NO. 500634100                     13D                          PAGE 3 of 6
===================                                                  ===========
================================================================================
     1       NAME OF REPORTING PERSONS
             S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

             City of London Investment Management Company Limited, a company
             incorporated under the laws of England and Wales.
------------ -------------------------------------------------------------------
     2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP            (A) |_|
                                                                         (B) |_|
------------ -------------------------------------------------------------------
     3       SEC USE ONLY

------------ -------------------------------------------------------------------
     4       SOURCE OF FUNDS*

             WC
------------ -------------------------------------------------------------------
     5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
             TO ITEM 2(D) OR 2(E)
                                                                             |_|
------------ -------------------------------------------------------------------
     6       CITIZENSHIP OR PLACE OF ORGANIZATION

             England and Wales
--------------------------------------------------------------------------------

      NUMBER OF           7    SOLE VOTING POWER
        SHARES                 3,638,394
     BENEFICIALLY       ------ -------------------------------------------------
       OWNED BY           8    SHARED VOTING POWER
         EACH
      REPORTING                0
        PERSON          ------ -------------------------------------------------
         WITH             9    SOLE DISPOSITIVE POWER

                               3,638,394
                        ------ -------------------------------------------------
                         10    SHARED DISPOSITIVE POWER

                               0
------------ -------------------------------------------------------------------
    11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

             3,638,394
------------ -------------------------------------------------------------------
    12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
             SHARES
                                                                             |_|
------------ -------------------------------------------------------------------
    13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

             12.68%
------------ -------------------------------------------------------------------
    14       TYPE OF REPORTING PERSON*

             IA
================================================================================



This Amendment No. 23 to Schedule 13D (this "Amendment No. 23") should be read
in conjunction with the Schedule 13D filed with the U.S. Securities and Exchange
Commission (the "SEC") on February 17, 2004 (the "Original Schedule 13D"), with
Amendment No. 1 to Schedule 13D filed with the SEC on March 1, 2004 ("Amendment
No. 1"), with Amendment No. 2 to Schedule 13D filed with the SEC on May 5, 2004
("Amendment No. 2"), with Amendment No. 3 to Schedule 13D filed with the SEC on
July 8, 2004 ("Amendment No. 3"), with Amendment No. 4 to Schedule 13D filed
with the SEC on August 31, 2004 ("Amendment No. 4"), with Amendment No. 5 to
Schedule 13D filed with the SEC on November 15, 2004 ("Amendment No. 5"), with
Amendment No. 6 to Schedule 13D filed with the SEC on December 23, 2004
("Amendment No. 6"), with Amendment No. 7 to Schedule 13D filed with the SEC on
May 18, 2005 ("Amendment No. 7"), with Amendment No. 8 to Schedule 13D filed
with the SEC on June 10, 2005 ("Amendment No. 8"), with Amendment No. 9 to
Schedule 13D filed with the SEC on July 5, 2005 ("Amendment No. 9"), with
Amendment No. 10 to Schedule 13D filed with the SEC on August 5, 2005
("Amendment No. 10"), with Amendment No. 11 to Schedule 13D filed with the SEC
on August 12, 2005 ("Amendment No. 11"), with Amendment No. 12 to Schedule 13D
filed with the SEC on September 14, 2005 ("Amendment No. 12"), with Amendment
No. 13 to Schedule 13D filed with the SEC on October 7, 2005 ("Amendment No.
13"), with Amendment No. 14 to Schedule 13D filed with the SEC on October 21,
2005 ("Amendment No. 14"), and with Amendment No. 15 to Schedule 13D filed with
the SEC on April 10, 2006 ("Amendment No. 15"), and with Amendment No. 16 to
Schedule 13D filed with the SEC on June 9, 2006 ("Amendment No. 16"), and with
Amendment No. 17 to Schedule 13D filed with the SEC on October 18, 2006
("Amendment No. 17"), and with Amendment No. 18 to Schedule 13D filed with the
SEC on November 8,2006 ("Amendment No. 18"), and with Amendment No. 19 to
Schedule 13D filed with the SEC on December 1 , 2006 ("Amendment No. 19"), and
with Amendment No. 20 to Schedule 13D filed with the SEC on July 9, 2007
("Amendment No. 20"), and with Amendment No. 21 to Schedule 13D filed with the
SEC on August 9, 2007 ("Amendment No. 21"), and with Amendment No. 22 to
Schedule 13D filed with the SEC on November 7, 2007 ("Amendment No. 22"), and,
together with Amendment No. 1, Amendment No. 2, Amendment No. 3, Amendment No.
4, Amendment No. 5, Amendment No. 6, Amendment No. 7, Amendment No. 8, Amendment
No. 9. Amendment No. 10, Amendment No. 11, Amendment No. 12, Amendment No. 13,
Amendment No. 14, Amendment No. 15, Amendment No. 16, Amendment No. 17,
Amendment 18, Amendment No. 19, Amendment No. 20 , Amendment No. 21, Amendment
No. 22 and, Amendment No. 23 ( the "Amendments"), by City of London Investment
Group PLC ("City of London") and City of London Investment Management Company
Limited relating to the shares of common stock, par value $0.01 per share (the
"Shares"), of The Korea Fund, Inc., a Maryland corporation (the "Fund"). This
Amendment No. 23 amends Item 5 of the Original Schedule 13D as amended by the
Amendments. All other information in the Original Schedule 13D and the
Amendments remains in effect. All capitalized terms used herein and not
otherwise defined shall have the meanings ascribed thereto in the Original
Schedule 13D as amended by the Amendments.


ITEM 5.  INTERESTS IN SECURITIES OF THE ISSUER.
         --------------------------------------

         Items 5(a) and 5(b) below are hereby amended and restated in their
         entirety and Item 5(c) is hereby amended as follows:

         (a) and (b). As of the date hereof, GEM, IEM, EWF, GFM, FREE, CEM and
         Accounts owned directly 554,238, 714,297, 389,791, 60,311, 717,387,
         415, and 1,201,955 Shares,

                               (Page 4 of 6 Pages)


         respectively, representing approximately 1.93%, 2.49%, 1.36%, 0.21%,
         2.50%, 0.001% and 4.19%, respectively, of the Shares outstanding (based
         on the most recent Share information publicly disclosed by the Fund).

         As of the date hereof, CLIG, through its control of CLIM, is the
         beneficial owner of 3,638,394 Shares, representing approximately 12.68%
         of the Shares outstanding (based on the most recent Share information
         publicly disclosed by the Fund).

         As of the date hereof, CLIM, through GEM, IEM, EWF, GFM, FREE, CEM and
         Accounts, is the beneficial owner 3,638,394 Shares, representing
         approximately 12.68% of the Shares outstanding (based on the most
         recent Share information publicly disclosed by the Fund).

         (c). Except as described below, no transactions in the Shares were
         effected by the Reporting Persons, or, to their knowledge, any of the
         persons identified in Item 2, in the last 60 days.


--------------------------------------------------------------------------------
PORTFOLIO       TRADE DATE      TRAN TYPE    PAR VALUE / SHARES      TRADE PRICE
--------------------------------------------------------------------------------
GBL             11/2/2007         Sell              50,000              48.9915
--------------------------------------------------------------------------------
GBL             11/6/2007         Sell               4,119                50.29
--------------------------------------------------------------------------------
CEM             11/7/2007         Sell                 365              49.7045
--------------------------------------------------------------------------------
Account         11/8/2007         Sell              21,400              48.2827
--------------------------------------------------------------------------------
Account        11/15/2007         Sell                 250                47.03
--------------------------------------------------------------------------------
GBL            11/23/2007         Sell               1,105              41.7543
--------------------------------------------------------------------------------
Account         12/3/2007         Sell               6,969               27.923
--------------------------------------------------------------------------------
Account         12/4/2007         Sell              15,000              28.1353
--------------------------------------------------------------------------------
Account         12/7/2007         Sell              45,200              30.0772
--------------------------------------------------------------------------------
GBL            12/10/2007         Sell               6,710              30.0417
--------------------------------------------------------------------------------
Account        12/10/2007         Sell              16,500              30.0417
--------------------------------------------------------------------------------
CEM            12/11/2007         Sell                 150                29.64
--------------------------------------------------------------------------------
Account        12/12/2007         Sell               9,900              29.9436
--------------------------------------------------------------------------------
Account        12/12/2007         Sell              40,000              28.7759
--------------------------------------------------------------------------------
Account        12/19/2007         Sell              63,500              27.1176
--------------------------------------------------------------------------------
Account        12/21/2007         Sell               8,200              27.6088
--------------------------------------------------------------------------------

                               (Page 5 of 6 Pages)

                                    SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.



Dated:   January 9, 2008




                                            CITY OF LONDON INVESTMENT GROUP PLC


                                            /s/ Barry M. Olliff
                                            ------------------------------------
                                            Name:  Barry M. Olliff
                                            Title: Director





                                            CITY OF LONDON INVESTMENT MANAGEMENT
                                            COMPANY LIMITED


                                            /s/ Barry M. Olliff
                                            ------------------------------------
                                            Name:  Barry M. Olliff
                                            Title: Director













                               (Page 6 of 6 Pages)