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!