en Cuevana 3. 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