Wheesung sang "I'm Happy" on the July 14th installment of 'Immortal Song'.
For the special dedicated to composer Kim Hyun Chul, Wheesung covered legendary singer Lee So Ra's "I'm Happy". The R&B artist dedicated the song to his late father, saying, "It was hard to sing the final verse." Host Shin Dong Yup also commented, "I almost cried, so it was difficult to host the show."
Though Wheesung's touching performance won him one round, it was The One who took the final win.