In addition to the joint written opinion faxed to the National Assembly of S. Korea, the IFPI submitted its own comments to the competent standing committee which deals with the bill probably in this June.
In the comments, the IFPI describes the three-strikes-out rule as a model provision for a healthy “copyright ecosystem” and insists that returing to growth in 2009 of the Korean music industry is due to a series of legislative amendments including the three strike law. But I do not think this arguement is persuasive because there is no or little corelationship between the growth of music industry and the amendment which disproportionally strengthened the level of protection and enforcement of copyright.
Here are the comments of IFPI and its analysis of Korean music industry, all of which were delivered to the National Assembly during the second week of this month (April 2013).

IFPI is very active in this opposition. The Asian regional director Mr. Ang visited in person Mr. Choi in February (see photo below). During the meeting, the IFPI persons tried to lobby Mr. Choi by arguing that the three strike rule has made South Korea a good example for the online music industry and if this legislation is repealed they are standing naked. And they insisted that the fall of the music industry since 1999 was because of online piracy.

From left: Heesob Nam, Lawmaker Mr. Choi, Mr. Ang from IFPI Asian Regional Office, Mr. Benjamin from IFPI Asian Regional Office, Ms. Lee from IFPI Seoul Office