The press conference for 'Sound of Heart' took place on December 8!
SEE ALSO: KARD x AKP Collab Merch!
During this, Lee Kwang Soo made a promise for the drama's viewer ratings. He said that if the ratings go over 10%, he would go on KBS 2TV's singing show 'National Singing Contest' with the cast members!
He said, "I expect it to go over 10% in viewer ratings and, for now, will start practicing [singing] with the other actors."