Upon learning Jin Xun An had been emotionally hurt in the past, Bai Lang becomes adamant about uncovering the reason behind it. Meanwhile, Big A, the youngest dentist at Jin Xun An's clinic, finds himself crossing paths with a peculiar patient who has apparently been assigned under him.

In a strange twist of fate, a man who was once in a relationship with Jin Xun An suddenly makes a reappearance in his life. Will this "lover from the past" become an obstacle to the growing affection between Jin Xun An and Bai Lang?