Ruan Tiantian, a working girl who has always depended on others, receives a special opportunity to obtain a "contractual identity," allowing her to enter the life of a wealthy and influential family. Lu Yanshen, the man connected to this arrangement, is calm, refined, and strictly follows the terms of their agreement. What begins as a transaction involving an exchange of identities gradually develops into an unexpected warmth as the two spend time together. Despite the enormous gap in their social status, the rational and reserved Lu Yanshen and the straightforward, courageous Ruan Tiantian grow closer as they support each other. When love blossoms, family pressure and society's judgment come their way. Ruan Tiantian chooses to face it all bravely, determined to rewrite the ending of an encounter that began with a contract and turn it into a lifelong love.