At his first job, Ji-won unexpectedly runs into Yeon-su—his childhood friend’s older brother, and his very first love.

Believing this is his chance, Ji-won boldly shows his feelings to Yeon-su. But when their relationship makes no progress, he grows restless… until one mistake leads to a one-night stand with him.

Yeonsu misunderstands Jiwon as being promiscuous, and their relationship keeps going astray.
Still, Jiwon doesn’t give up and continues to approach Yeon-su, who has the wrong idea about him.
“I like you, Assistant Manager.”
Gu Jiwon’s clumsy but determined mission: winning over Assistant Manager Baek Yeonsu’s heart!