Zhu Ling transmigrates into a novel. Determined to change the original plot in which the original heroine suffers a horrific fate, being thrown into a primeval forest to feed a giant python by Yu Ci, the young master of Haicheng, she decides to stay away from the male lead. However, while trying to add her younger sister on WeChat after the original heroine deleted her, she accidentally mistakes Yu Ci's WeChat account for her sister's. From then on, she showers him every day with affectionate messages, calling him "baby" over and over, sending red envelopes, snacks, and goodnight voice messages without missing a thing. After waking up from a car accident with his memories completely wiped, Yu Ci sees a contact on his phone saved as "The Perfect Girlfriend of the Fifteenth". Before he knows it, the male lead has been completely smitten.