It was a great party, the previous night. Taeyeon can't stop thinking about it. Maybe not in the best way, however. Following days, Taeyeon begins to act strangely as her mind grows increasingly stressed. It affects her daily life and work until she nearly has a mental breakdown. What happened that shed new light on the night the last weekend? 

"…Of all people, why did she think it would be from Jiyong?…" 

Main Characters