Always someone close to you that does the betrayal, probably linked to the half brother or the mother or her side of the family the Chu's, wouldn't be surprising.

I was guessing the half bro as well, but you're right, it could be the half bro's mom and/or fam as well.

Why is the MC useless in this ep

The bigger the family the more internal strife it begets.

Brings out Gollum his precious lol

Why the MC not attack the weak bronze guys? I thought he was going to get some practice in.