You and Taehyung used to date when you were teenagers but it was your first relathionship, neither of you had experience, and those kind of relationships are easy to break. Thats what happened, you let him go and he left, you didn't talk anymore.

A few years ago you were already in your late twenties when Taehyung came back to the town. You were surprised when you saw him at the beach, your love had came back to you.