Taeyeon, an ex-popular, fun loving student who swap in the life style to focus in university.
After a year, she becomes bored and sick of a routine where she can only focus on work, and
whish to go back to her original life style.
If she going to make a mistake of trading doing well in life for friendships and relationships, or regret for not doing so?
She stays undecided until someone makes an impact in her life.
Cameo apperances of Exo.