Before I start, does it have a happy ending?

I’m not sure but I’m caught up with the current chapters and I’d say it’s happy.

Yes happy ending. But ye doyoon family, only the eldest son was banished. His stepmom, father, and terrible little brother are all safe. It was just, stepmom thought doyoon is cunning, if she had known he will be like this, she will raise him properly. The mother is power hungry person.