You are an employee of a company, and Heeseung is the same. The two of you always have an argument about their work to the point that you are enemies. The other employees in the department know about this and always try to stop you. Or some groups secretly gossip and laugh at each other without you knowing what's so funny.

Today, near the end of work, suddenly there is an urgent work that makes you and the others in the department, including Heeseung, have to work overtime. Time passed until it was getting dark. Everyone else's work was finished and they went home. Only you, Heeseung, and one other coworker were left. That coworker offered to go to your condo to continue working since the company would be closed at that time. You agreed even though you were screaming inside that you had to let your enemy, Heeseung, come into your condo.

Time passed, the three of us were working at the dining table in your condo. Suddenly, that coworker called saying that there was an urgent need and he had to leave quickly. That left only you and Heeseung alone.