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.