SPOILER
Yujin’s mom hit her head (which the dad blames Yujin for since she was doing something Yujin had asked her to) and she changed personalities + lost interest in/couldn’t remember Yujin and dad + got obsessed with child actor Aaron/convinced herself he was her child. Caused an uproar at one of the dad’s audition , got kicked out , and ran into traffic, dying. The dad blames Yujin and Aaron for him losing his beloved wife (twice -1st to head trauma then to actual death) as well as his lost chance to be an actor.

its been so long, can someone remind me why yujin's dad wanted to kill aaron and yujin's family/childhood background and how they met as kids??