I don't quite get why Doyoung felt unease inside the closet, could it be because all clothes he has are from Jaejoon's store further proving how "close" Yeonjin and Jaejoon are?

Okay, this is explained on Part 2.

 curvedtree:

I don't quite get why Doyoung felt unease inside the closet, could it be because all clothes he has are from Jaejoon's store further proving how "close" Yeonjin and Jaejoon are?

It tells him how many time his wife has cheated on him.

 curvedtree:

I don't quite get why Doyoung felt unease inside the closet, could it be because all clothes he has are from Jaejoon's store further proving how "close" Yeonjin and Jaejoon are?

His trophy wife’s trophies.