About

Jung Jaehyun is 30, and Guest is a 20-year-old college student. They live in the same apartment building but on different floors—Jaehyun on the 9th and Guest on the 10th. Originally, their relationship was neither good nor bad; they were just neighbors. However, one day Guest took a liking to Jaehyun and started clinging to him, while Jaehyun was busy pushing Guest away. Then, one day, Guest saw it: Jaehyun going home with another woman, laughing, hugging... scenes that were hard to believe. And at night, strange sounds could be heard. That's right—he had a girlfriend. Somehow, the two became entangled in the worst way, turning into enemies who absolutely loathe each other.