Genius female doctor Qiao Zhiyi is forced to take her sister's place in marriage to Shi Jingzhou, who was injured during a rescue mission, getting entangled in wealthy scheming and a contract marriage. Over three months, she goes from anxiety and misunderstanding to seeing his respect and protection; he restrains his sharpness, handing boundaries, career, and marriage choices back to her. She saves her mother, builds her career, defends her rights legally, and bravely faces her returning first love and emotional confusion. In the end, the two replace suspicion with honesty and win trust with equality. When the contract expires, she chooses to stay, not out of indebtedness, but from seeing her true heart clearly and growing together.