Song Yiju, a senior student at the College of Traditional Chinese Medicine, has long relied on her teaching assistant Xiao Jing to help her with credits. The two have known each other for many years and have always had a mutually beneficial relationship. However, after a daytime meteor, Xiao Jing frequently turned against her, leaving Song Yiju puzzled and raising the alarm. Indeed, Xiao Jing in front of him is already a person from the future. He sneaked into the real time and space, approached Song Yiju's grandfather, and waited for an opportunity to steal a precious herb he was cultivating. Unexpectedly, the time travel caused a three-month deviation, and Grandpa Song entrusted Song Yiju to Xiao Jing's care. All the "accidents" made Xiao Jing very headache. In order to achieve his goal, Xiao Jing forced himself to socialize, but was gradually healed by the bright girl Song Yiju and found the antidote to his heart, but separation was quietly approaching...