Twenty years ago, Su Yun risked her life to save Shen Lan, and Shen Lan promised a children's marriage alliance to repay the grace. Twenty years later, Zhou Linlin assumed a false identity, carrying a token to force a marriage visit, cornering the Shen family with public opinion pressure. Shen Lan stood firm against internal and external doubts to uphold principles, secretly rescuing the truly imprisoned Su Wan, and bringing the impostor and her accomplices to justice. In the end, Shen Lan let go of her obsession, funded Su Wan's return to campus, supported her in choosing her life independently, and truly fulfilled the promise of gratitude from back then with respect and kindness.