Only Kind to Me is a story about unrequited love, personal growth, and the enduring power of first love. Leewon, a model student, harbors a secret crush on Seonhangun, the popular and rebellious boy at his school. Despite their differences, the two form a unique bond during their middle school years. However, life pulls them apart, and they go their separate ways.

Eight years later, Leewon, now struggling with PTSD and emotional numbness, returns to his hometown of Busan. There, he unexpectedly reunites with Seonhangun, rekindling old feelings and confronting the unresolved emotions from their past. As they navigate the complexities of their relationship, they discover whether the power of their first love can overcome the challenges of time and personal growth.