Sang Nan, an overtime maniac, unfortunately died suddenly after staying up late one night to work overtime. However, he accidentally traveled to the world of a novel and transformed into the male protagonist's substitute for Bai Yueguang, and was magically bound to the female counterattack system.In order to return to the real world, Sang Nan must complete the system's ultimate task - to increase the male protagonist's heartbeat value for her from 0 to the full value of 100, so as to counterattack and become the heroine in the story, opening a new chapter in her life.