Yang Fei, who possesses extraordinary skills but suffers from a hidden injury, follows his master's orders and enters a flash marriage with Qin Yanyang. He needs to heal his injury, and she wants to escape a family-arranged marriage. After the wedding, the two each hide their identities and gradually develop feelings for each other as they spend time together. Yang Fei uses his lost medical arts to treat patients and resolves the many crises created by Zhang Yunqing; Qin Yanyang also stands by his side throughout to face them together. After experiencing misunderstandings and trials, the two confess their true feelings and join hands to break through the impasse, and their contract marriage ultimately becomes a firm choice they make for each other. Adapted from the novel 'Urban Invincible Overlord' by Baiyue Louzhu.