There is an extra summer in the world. The four of them grew up with Jiaojiao. Her father seized the opportunity to make a fortune but still stayed in the old house to share the hardships with the four of them. His grades were quite good, but his personality was different from Jiaojiao's, gentle and considerate. What kind of chemical reaction will there be when Xia Tian, who only sees his charming sister, meets the sunny and handsome Ma Tian?
To put it simply, Xia Tian only sees Jiaojiao, and Ma Tian is just a "mistress"
Concept: The ignorant happiness of youth