A childhood engagement arranged between the Qin and Fu families since the grandparent generation. After Fu Chuan went missing, it was transferred to the adopted brother Fu Zichen. After Fu Chuan was found, it was returned to him. At the time of the story, the Qin family had not been informed of the cancellation. Fu Zichen agreed to take the engagement for Fu Chuan, but in reality intended to keep it since the Qin Group later prospered.
