Reading most of the comments/reviews feels like you're going to watch something horribly bad, which is far from the truth
I think they were hoping to see another BL/GL-happy ending stories while in fact this drama isn't a GL series, heck this isn't even your typical drama
It brings topic that not many drama seems/dare to care such as child abuse, sex worker, stalker, bullying, broken home

Kairi has a "different" sexual orientation because of the repetitive sexual assault from her mother's boyfriend(s) so the trauma is what's causing her twisted outcome
one reviewer said that her behaviour is disgusting and pervert just because she kept her friend's underwear, well let's just say if you were a kid and was given a handkerchief by one of your friend because you had an accident while your other classmates don't care and while your parents alse forced you to work outside school hours, I think you'll cherish that handkerchief as symbol of love and caring

The two main characters has great acting and chemistry, despite some of the dialogues were a bit vulgar (again this is not a teen drama), the conversation is deep and feels real (like when they discussed the meaning of friendship)

If you want to give this drama a try, please make it to at least eps.3, but don't watch it if what you seek is a GL series
The topic is a bit dark, so please judge or review it accordingly