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When Yu Chuning was 18 years old, she suffered from a strange disease and would transform into a man from time to time. From then on, she lived a divided life of being a woman one week and a man the other week, and was forced to play two roles: "sister" Yu Chuning in normal state, and "brother" Yu Chuci after transformation. "Sister" is an extremely stingy working girl who works part-time as a DM in a script-killing shop, while "brother" is an aloof literary young man who is a contracted author of a script-killing shop. One day, Yu Chuning met Shen Shi, the president of a venture capital company. The "sister" and he were at odds with each other, but the "brother" became good friends with him. On one side is "evil fate", on the other side is "brotherhood", and a wonderful love affair that is chaotic, dislocated, and frivolous begins...