tvN's new Saturday-Sunday drama 'Forehand' is a classical music drama that depicts the friendship, love, competition, and growth of musical geniuses. Song Kang plays the role of piano prodigy Kang Bio in his comeback work after discharge, while Lee Jun Young plays Choi Jung Yo until enlistment. The two characters show their conflicts and reconciliation. Jang Kyu Ri plays Hong Jae In, a viola major. 'Forehand' is a technique in which two people play one piano together. Through this, Kang Bio and Choi Jung Yo, who have walked different paths, get closer and experience changes in their lives.