The fifth OST ‘What If’ of “Record of Youth,” sung by singer KIM JAEHWAN, will be released on various music sites on September 29 at 6 pm. This song was first inserted in the monologue scene of Sa Hye-jun (played by Park Bo-gum) in the second episode, which aired on September 8, and aroused viewers' curiosity.

‘What If’ is a new type of song that adds an R&B feel to a medium-tempo pop ballad song, with a feeling of warmth and courage that inspires comforting and bright energy. The lyrics that exquisitely melt youth's worries, wanderings, and love elicit sympathy from the listener.