Fallen top celebrity Lin Bei owes thirty million in breach of contract penalties, making a living by delivering food. Shen Qingwan takes out a contract: monthly rent of eight hundred, to play her boyfriend and cope with family pressure together. Lin Bei signs the contract, getting dragged into wealthy family internal struggles from then on. In the days of posing as a couple, the two go from taking what they need to relying on each other. Lin Bei helps Shen Qingwan find the company mole, and Shen Qingwan helps him face the past directly. A contract of "cannot truly kiss", two people who dare not deliver their true hearts—when rules are broken by heartbeats, they finally understand some bonds were never a transaction from the very beginning.