Originally, the relationship between the two families was just that of neighbors who were isolated by the door. However, after the Lu family's wife was sent to the hospital by the Qin family's wife because no one was around when she was giving birth, the two families forged a deep friendship. Qin Linfeng also gained a younger sister who was taken care of by him since childhood. He has also become what people call his childhood sweetheart, a term that Qin Linfeng is very fond of.
Concept: love between childhood sweethearts.