The Ex-Files 4 tells the story of two best buddies, Meng Yun and Yu Fei stumble their way through marriage while Meng Yun has trouble finding the right one and Yu Fei is dealing with a trial marriage. This 4^th installment of the No.1 Rom-com franchise in China shows the diverse perspectives towards marriage among young people in a light-hearted and supplicated way, seeking to resonate deeply with the grand audience with the universal dilemma of marriage.