Su-ho and Hyeon-seo, who once dated for six years, meet again as a youthful rich CEO and a piano instructor. K works with Su-ho on a collaborative project and invites Hyeon-seo to join them. Su-ho and Hyeon-seo embark on a bumpy romantic journey full of twists and turns. Will history repeat itself?Original title: 사운드트랙 #2 (2023)