The squeamish and easy-going Xiao Xiao has always regarded her childhood sweetheart Liu Wanglong as an older brother. He is the best punching bag for her to vent her anger on when she is angry, and the best place for her to vent her bitterness when she is broken up... But accidentally, because of a bet, the two of them had an affair after drinking. We are all adults! This should be dealt with rationally as an accident, but he refused to do so and pursued her to take responsibility. But at this moment, the vixen who snatched her ex-boyfriend away appeared again, and this time she will never be allowed to snatch her brother away again... But is she feeling unconvinced or...