Responses
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Well if you've read enough BLs, in most Korean manhwa either the dad, mom, step bro/sis or extended family members are psychos. In some rare case, it is a true outsider or a friend who is a villain but usually not enough + some family member must be involved too lol. It's part of the drama plot.. so we just need to guess the worst villain of all..
Why do authors keep making this kids psychotic brother that's hella scary