Lawyer Wen Xi made an agreement to marry Shang Chen because of his mistaken identity. From the awkward separation to the agreement to talk on the phone every week, the two gradually got closer despite the Yan family's difficulties, their adoptive mother's coercion, and workplace turmoil. Shang Chen is rigid on the surface, but he supports her many times; Wen Xi is cold and independent, but gradually learns to rely on her. When Yan Zhao's farce came to an end, the two hugged each other under the sunset, going from "suitable" to "it must be you"