[Kang Seung Jae]

Originally Posted by SeedFreedom

New theory!

Spoiler for ep 9:

The person in the fire... So far the only people who were confirmed in the house when the fire happened were Nanaka, her mom, and her dad. Now the person in the fire seemed clam, and didn't run out. So i'm going to go ahead and assume that that was her father. If the uncle did set the fire, he would have escaped. Now why would you stay in a burning house... unless you set the fire in the first place? Maybe the reason the uncle doesn't want them to find out what happened is because he doesn't want to tarnish his brothers name? Or he knew about it before and feels guilty for not being able to stop him? I'll see if my theory pans out over the next 4 eps

My basic idea is similar to yours: I think the uncle is related to the fire, but not the one who started the fire.