Thirty-year-old Zhihong, who is still living with his sister, is a useless young man in the eyes of everyone. His daily pleasure is to peek at his sister's girlfriend Li Yifan through the crack of the curtain. A turmoil about Yifan's relocation gave the two a chance to spend time alone. As their relationship progressed, Zhihong gradually released his long suppressed desire
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In this futuristic world of 204X, everyone has the chance to freely choose their gender when they come of age. Yi An, a young person on the edge of seventeen, likes and prefers girly and feminine aesthetics. He feels that he isn't masculine enough, but he doesn't feel like a woman either. Yi An is in love with his classmate Zhou Yang Kai, but she expects him to become a girl. Yi An questions whether his attraction to Zhou Yang Kai is based on a gender preference or a connection of souls.
