The KBS 2 TV entertainment program "Good Sunday - Superman Returns" actor Jang Hyun Sung's two sons Jang Joon Woo and Jang Joon Soo learned how to dance from their idol group, Akdong Musician (AKMU). On the June 1, 2014, episode of the KBS 2 TV entertainment program "Good Sunday - Superman Returns" Jang Hyun Sung, Jang Joon Woo, and Jang Joon Soo learned how to dance from Akdong Musician. They danced to Akdong Musician's hit song 200%. Actor Jang Hyun Sung's two sons Jang Joon Woo and Jang Joon Soo couldn't stop laughing out of embarrassment, but they enjoyed spending time with their idol musicians.