First of all, let me say that the acting and the story itself are at the highest level, the actors did an excellent job. I really enjoy watching the series exactly when someone is telling their life story.

we have a life story between two completely different characters. A do ho who is unhappy is somewhat negative and endures everything only to one day disappear from an unhappy environment.
Yeong, who has a dysfunctional family, but is always positive, willing to help everyone. he always looks at everything around him with a big smile.
Do Hoa just needed someone like Yeong. To give him some joy and positivity of a track of hope in the blackness in which he found himself. and Yeong succeeded. Do hoe finally got the light he needed in his life with someone he can rely on who is there for him whenever he needs it. Until the day he had the exam to get revenge for Yeon, he thought of hurting his father. Yeon was picked up by his family and no matter how hard he tried to get to Do hoe, he couldn't. Do Hoa left him. Yeong came back not only to take care of the coach but because he was waiting for Do Hoe to come back the whole time. 12 years later I know they still love each other but to leave someone for so long without a word. to hurt a person who has never hurt you. I know they still have feelings for each other, but I can't get over it. In all of this we have the proud and arrogant Hyeon who was either in love with Do hoe who bullied him throughout high school and you become friends with him. Do Hoe is a bird with broken wings and Yeong is a bird whose wings have been broken. Do Hoa said that he is finally free, maybe he is free, but he still has a noose around his neck.
you can't run away from problems and the past, they will catch up with you when then. I think that when Do Ho arrived, he couldn't believe that Yeon had been waiting for him in the same place for 12 years.that he took care of his father. not only that Yeong lost his love, his coach, but he also lost a home and a job. I honestly don't know how the story will unfold, but honestly I couldn't get over everything. if I don't know what was in the story, one sorry is not enough