I personally don’t want them together because of all the problems she’s caused him.
But she did not cause problems sure she was part of the reason why her useless dad was mean to the family but there were other reasons and factors to what actually made the problem huge like the mystery of why Se-Ri mom and him left the brewery, Gang-Su's abandonment and various kept secrets and plus once Se-Ri knew about what was going on she came to apologize on her parents' behalf and that is something the parents NEVER thought of doing.