The immensely popular EX-FILE franchise now comes to its fourth sequel in which we see buddies Meng Yun and Yu Fei coming to an age to talk about marriage. In order to avoid problems after marriage, Yu and his girlfriend Ding Dian create a marriage cooling-off period to preview life after marriage in advance. The ups and downs of marriage indeed become challenging tests for the relationship between them. Changes in friends around and pressure from parents are getting to make Meng think about marriage. With the question “why do people get married”, he starts a blind date journey, allowing him to learn various concepts of marriage and love from his different blind dates, which makes him even more confused and struggling. At an unexpected alumni gathering, Meng reunites with his first love. After many years, his heart is still pounding at the sight of her. He seems to finally catch a glimmer of hope, but would this girl really be the chosen one?