Well, I read the raws and I don't understand Korean much so I might be wrong. And i don't remember their names much...
Dongwoo and sujin parents are engaged, and both of them knew about this and decided to confront the father, revealing their relationship. Sujin met dongwoo's dad and the dad had this sudden change of heart after seeing how much dongwoo loves sujin and turns him better. So, the father cancelled the marriage with the mother and luckily the mother accepted it well, probably cuz they wanted the best for their sons. So yeah, they didn't get married I guess.
Well, I read the raws and I don't understand Korean much so I might be wrong. And i don't remember their names much...
Dongwoo and sujin parents are engaged, and both of them knew about this and decided to confront the father, revealing their relationship. Sujin met dongwoo's dad and the dad had this sudden change of heart after seeing how much dongwoo loves sujin and turns him better. So, the father cancelled the marriage with the mother and luckily the mother accepted it well, probably cuz they wanted the best for their sons. So yeah, they didn't get married I guess.