She didn't ruin their life she wasted their time. Life still goes on and you will find their are plenty of people like that.
she actually did if u think about it, they're still young and she kindly shat in their mental health so some of them (mainly the guys) may not experience the same life they did before meeting her. Disability-adjusted life year (DALY) defines it lol (I'm joking, kinda)
She disrupted their life but she didn't ruin it. All she did was just give them a experience in life. When time passes that is all it will be just a experience. In Hyunwoo's case Hyesol is just another abusive person that is out of his life just like his parents. Hyunwoo sees it as a loss right now but it wasn't. Ultimately though whether Hyunwoo realizes this and how he moves on depends on the writer.
I said I was joking bruhh, btw I don't think there's anything special left for huunwoo cuz he's played his role and that's it. He was only a pretty trash can and something to spice things up (in author's mind)
What a total dumbass bitch (๑•ㅂ•)و✧ damn she ruined their life and for whaaaaat?