I don't think he's using their money after all he has his own successful career.
His band is becoming famous but not succesful enough to make so much money. If it is, heesoo would have had enough money to send hyesung overseas. Heesoo is his band’s member too. So it means all money he spends is his family’s money.
And it is stupid to hate his family. It is too obvious that they will soon accept. He is blaming them for hyesung’s depression. But actually he depressed by his past guilt. I can not underestand dojin’s mind, really. He can underestand his wife but can not underestand his dad?. He suddenly came to him with his wife and child. Then said to him “we were bonded”. And saying such things like “u’re my only family”. Ohh come on, who must be raised him when he was weak little baby. Who must be changed his diapers. Who must be fed him. I know they are rich, but every parents who loves their baby cares their child at least first few months.
Caring for physical needs doesn't necessarily make you a good parent.
I know you all gonna hate me but if dojin doesn’t want to have anything to do with his family,what about stop using their money first?!