We can clearly see from the flashback that mincheol was really caring , a good guy and suffered and sacrificed to live happily with his love! It's the harsh circumstances that made him change and become despicable. What guarantees that Tae ha won't become the same later on? His behavior is already strange
We know that he won't become like Mincheol because he has money. Pretty much the only reason I can think of. Binaritou
So if his dad doesn’t provide Taeha money, then he’ll be poor, and after some time they will get same kind of problem the he will become like Mincheol !
We can clearly see from the flashback that mincheol was really caring , a good guy and suffered and sacrificed to live happily with his love! It's the harsh circumstances that made him change and become despicable. What guarantees that Tae ha won't become the same later on? His behavior is already strange