The correct answer is option 2, South Korea. Roh Moo-hyun was the President of South Korea from 2003 to 2008. In May 2009, he tragically committed suicide.

Option 1, Japan, is incorrect as Roh Moo-hyun was not the President of Japan.

Option 3, Indonesia, is incorrect as Roh Moo-hyun was not the President of Indonesia.

Option 4, North Korea, is incorrect as Roh Moo-hyun was not the President of North Korea.

It is important to note that the suicide of a President is a significant event. Suicide is a complex issue, often associated with deep personal struggles and mental health challenges. It is a tragic occurrence that can deeply impact not only the individual and their loved ones but also the nation as a whole.