Stories related to youth will never go out of style, and the years related to youth will always be unforgettable. The male and female protagonists of the story walked through each other's youth hand in hand, from the innocent and sweet student days to the vast sea of people forgetting each other. The two have experienced misfortunes and tribulations, family changes, the death of friends, the betrayal of friends, and the frame-up and instigation of others. After all these experiences, the two were separated in the sea of people. One went to a foreign country with pain, and the other spent every day with hatred. When the two meet again, things have changed. Can the old lovers reconcile, and can they pick up the love of the past again...