The Su family swapped children back then, and the true daughter, Su Wan, to repay her family's debts, agreed to marry the head of the Li family, Li Sihan. Treated as a substitute for an old flame and suffering all kinds of grievances, she unexpectedly discovers she is the childhood sweetheart he has been searching for for years. At the birthday banquet, she exposes the true face of the fake daughter Chu Mengqi, and Li Sihan, full of remorse, embarks on a journey to win back his wife. Chu Mengqi takes risks to create trouble and is finally brought to justice. The two resolve all their emotional knots and stay together happily for a lifetime.