Yamato doesn't have parent issue. He just couldn't accept that his dad somehow part of the reason of his friend's parents' death. i would say that is more of denial than issue. Hozumi has a parent issue because his dad is def problematic.
In-hun has the characteristics of the worst type of man. He pretends to be nice so he can use Nakyum and when Nakyum isn't proven worthy anymore, he discards him. Trash. At least Seungho is already honest how trash ge is, but In-hun is just rotten to the core.
he got what he deserves lmao never disturb a man eating his delicious food