Where did Kim Se-ui from Gagseyeon spend all his money?

He was originally the son of an extremely wealthy family,
and Gagseyeon used to be the #1 place in the world for Super Chats.
It's not like he was gambling,
so where did he spend it all?
Even if we assume he invested in musicals,
it's not like he spent 10 billion won on them.
He's practically broke now,
so where did it all go?
A big part of his downfall was making increasingly reckless moves because of money.