A rescue on a rainy night leads to an accidental bond between Gu Qingtang and Jiang Yan. To make their own decisions about marriage, the two register their marriage, agreeing to separate peacefully after three months. During their time together, Jiang Yan relies on his calm judgment and actions to repeatedly help Gu Qingtang solve career difficulties, and his mysterious past with the Jiuzhou Alliance gradually surfaces. From the initial contract relationship to trusting and protecting each other, the two gradually recognize their true feelings through their shared experiences. When the three-month agreement expires, they finally understand that what truly matters is not a piece of paper, but the sincerity to walk hand in hand.