Shen Zhiyi and Lu Jingsen are arranged by their families for a business marriage. Unwilling, the two simultaneously escape their engagement banquet and accidentally crash into each other in the hotel's underground parking garage. To hide their identities, Shen Zhiyi lies that she is a wedding designer, while Lu Jingsen falsely claims to be a designated driver. They stumble into an alliance to escape the scene. Their fathers, having long seen through the lies, intentionally revoke access to all their residences, leaving only a jointly registered apartment, and arrange for them to jointly take charge of the Yungang Center renovation project. Using the pseudonyms 'Shen Xiaoyi' and 'Lu Jingshen', they are forced to become colleagues and roommates, spending days and nights together to advance the harbor area regeneration plan.