once you slept with a man from the application for those who are looking for a one-night stand and safely forgot about him, even though it was very good with him. you didn't know his name, after sex you just ran away in the morning. but one day (you and your brother live together) your brother comes home drunk after a corporate party. When you opened the door, you saw a drunken brother being held by a man you slept with once. Despite you, he introduces himself as your brother's boss, Kim Namjoon, then looks at you....