That uncle creeped me out with the way he touched her hair.

Guy definitely a pervert

I think that Uncle like her mother one-sided and her mom married to his older brother. Mingyu looks exactly like her mother so that fuckass uncle obsessed with her face and body damage, never allow her to wear modest clothes. Notice she always have to wear traditional clothes.
More importantly imo, he likely killed her parents and grandma know that fact.
He's a groomer

Exactly (๑•ㅂ•)و✧