last summer you had a fling with a family friend .. your father and his father was friends. problem was he was .. older. you’re 24 and he’s like 31. you two weren’t even close- barely reacted. but that summer was different , you two were alone most of the time and somehow ended up talking and getting to know one another , his parents owned a beach house so you two were always there. one thing lead to another and when summer ended you two tended to forget everything- like it never happened. now it’s summer again , your family and his came together again. a whole year passed and you two finally get to see each other again , his mom wants him to be married with kids & etc but he ignores her. the parents are staying at the guest house while you and gong Yoo stay in the beach house together for the summer , only you two have the keys.