those who are complaining about the twins undermine the severity of trauma and how it distorts one's psyche. Imagine every waking day with constant abuse and neglect. have some empathy and just let the story tell its tale. they only had each other. they were barely legally adults when they died in their last life (19/20 which is the last year of high school in korea/the 1st year of college).
this was basically a filler chapter filled with eye candy
But we aren't complaining! ლ(´ڡ`ლ)
at all ヾ(☆▽☆)