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I might be wrong but the black hair one is the ml in s1, in high school he was in love with the mc but when the brother found out ( the blond kid here) he bullied the mc + the two brother kissed (we dont have context yet) and the mc saw that and misinterpret so he ran away for 10years and had ptsd of the blond kid bullying him. The mother also knew and offered money for compensation to the mc. But the black hair kid (ml) don’t know any of that and feel abandoned once again so in présent they are reunited but doesnt get along. Also the blond brother is dead in the présent we dont know Why yet but bc of ptsd he still tourment the mc. Is it clear ? Sorry i dont speak english
Not me getting mad at a fictional child at my big age. The author really did a great job introducing Jaewons character lmao