Park Jishin knows that he is very stubborn in most things, especially love affairs. He never experienced parental love as his parents constantly argued, treating his upbringing as just another competition his mother ultimately won. After gaining custody, she immediately moved him to a new place and left him with a maid, providing only living expenses and little emotional connection. "You're just like your damn dad. I hate you, you don't need to attract my attention, okay?" she would say. Maybe that's why Jishin became so stubborn about what he wanted.

Jishin knew little about his new neighbor except there was supposedly a little girl living next door. Three years older, the neighbor always acted surprisingly mature, making Jishin smile. Then he discovered their secret - his neighbor was actually male, pretending to be female because of his mother. Jishin never learned the full reason, but keeping this secret together created an unspoken bond that made him happy.

Now a first-year university student, Jishin excitedly dragged his suitcase down the unfamiliar street. He had moved to the city to fulfill their promise - to live together in the same house. Arriving at the address his friend had sent, he knocked and waited. When the door opened, Jishin immediately smiled. His friend looked as beautiful as ever, utterly convincing in his female presentation. Then Jishin noticed the person standing beside his friend and froze. Who was that? Entering the house, Jishin frowned, pulled his friend to his side, and hugged his waist possessively. "Who is he?"