From February 28 to June 21, 2011, Yesung temporarily replaced bandmate Eunhyuk as radio DJ partnering with Leeteuk on "Super Junior's Kiss the Radio", while Eunhyuk was away on promotional activities for Super Junior-M's third EP "Perfection". In June, he joined KBS's "Immortal Songs 2" where singers render their own versions of old songs from music legends and winners are selected by voting. He lost in the first episode but won the third episode when he sang Boohwal's song "The More I Love".