While looking for his beloved robot vacuum, fastidious CEO Jang Seon-gyeol runs into Gil O-sol, a job seeker who doesn’t mind a bit of untidiness.

Seon-gyeol gives O-sol one week to pay for damages. Growing more desperate, she decides to apply to one more place, where her skills may come in handy.

O-sol runs into Seon-gyeol at her new job. When he later finds her drunk on the street, he reluctantly gives her a ride home but ends up regretting it.

Seon-gyeol wakes up in the hospital but has no idea how he got there. O-sol tries to comfort her father and astounds everyone at work with her new look.

Seon-gyeol makes a rash decision that he soon regrets but keeps doing things he can’t explain. O-sol is stunned to learn about Seon-gyeol’s condition.

Seon-gyeol becomes distraught when he learns about O-sol’s new assignment, but can’t get hold of her. O-sol is bewildered by Seon-gyeol’s actions.

Baffled by Seon-gyeol, O-sol pours her heart out to a neighbor. Distracted at work, Seon-gyeol comes to realize something -- but it may be too late.

Choe Ha-in’s revelation catches O-sol off guard, but his words keep swirling in her mind. O-sol helps Seon-gyeol during a precarious situation.

O-sol grasps what her job means to her and resumes work. When she’s falsely accused by a client, Seon-gyeol defends her, putting the company at risk.

Seon-gyeol is puzzled to find O-sol at his place, but things get more awkward when his mom stops by, and he later sees changes at home and in himself.

O-sol is perplexed by Seon-gyeol’s attentive behavior. Seon-gyeol panics when an unwelcome visitor arrives, and his mother later asks O-sol for a favor.

O-sol keeps telling Seon-gyeol that she’s not looking to date, but he arranges an impromptu surprise for her and reveals another side of himself.

Seon-gyeol admits O-sol is the first person to be empathetic about his quirks, but she decides to move out after coming to terms with her feelings.

Devastated by his grandfather’s revelation about AG Group, Seon-gyeol discovers he’s been betrayed by someone he implicitly trusted.

O-sol hears that Seon-gyeol is leaving for the U.S. O-sol’s family receives an overdue apology. Seon-gyeol wants to start over, but it may be too late.