Synopsis："Research scientist Lin Peiyu teams up with her boyfriend Su Jiming’s mistress to take revenge on him for cheating. After being exposed, Su Jiming leaves in disgrace and unexpectedly dies. But just a few hours later, he returns home completely unharmed. Lin Peiyu soon realizes that he is no longer human. His body has been taken over by a highly intelligent extraterrestrial lifeform. Driven by the possibility of making a groundbreaking scientific discovery, Lin Peiyu suppresses her fear and allows him to stay by her side. Pretending to remain his girlfriend, she secretly observes, records, and even teaches him. She teaches him about human emotions, and he learns with both sincerity and awkward determination. Starting with simple attempts to make her happy, he gradually becomes a part of her world. But as time goes on, Lin Peiyu finds herself unable to tell whether she is still studying him—or waiting for him to become a real human being."