Jjaksarangui Gyeongyeongjeollyak

At his first job, Ji-Won encounters Yeon-Su, his childhood friend's older brother and his first love. Seeing this as an opportunity, Ji-Won actively expresses his feelings for Yeon-Su, but he grows increasingly anxious about the lack of progress. Then, in a moment of inconsistency, he accidentally has a one-night stand with Yeon-Su. Yeon-Su misunderstands him as a slut, and their relationship becomes increasingly strained. Unconcerned, Ji-Won approaches Yeon-Su, who has misunderstood him.

"I like you, Manager."

Gu Ji-Won, a clumsy employee, embarks on a grand plan to win over Manager Baek Yeon-Su's heart!

(Source: MrBlue, translated)