South Korean pop singer and actor Jung Ji-hoon (L), better known as Rain, dressed in military uniform, stands next to Vietnamese emcee Hoang Ha (C) and Korean actor Kim Ji-hoon during the 2012 Korea-Vietnam Friendship Concert at the Opera House in Hanoi March 21, 2012. The concert is part of the 20th anniversary celebrations of the establishment of diplomatic relations between Vietnam and South Korea.[Photo/Agencies]

South Korean pop singer Yoo Seung-chan, dressed in military uniform, performs during the 2012 Korea-Vietnam Friendship Concert at the Opera House in Hanoi March 21, 2012. The concert is part of the 20th anniversary celebrations of the establishment of diplomatic relations between Vietnam and South Korea.[Photo/Agencies]