I don't know how it happens but I came across the same type of drama again - a great potential, a great mystery and main root of the story story but the FL is a horrible trash of a person hurting everyone around her. However, even though she's such a trash destroying and behaving like shit towards literally all the people who care about her, she's just forgiven by everyone and a ML who should basically put her in a toilet and flush it 10 times runs like crazy to help her instantly after discovering her motives.

She suffered - yes. She suffered because of her own stupidity and being a trash of a person in the first place. We may forgive her due to the pressure she faced taking care of her sister with autism. Ok - let's say she might have collapsed mentally, she made a mistake and left her sister on a train, her sister "died" because of her so now she has a regret and an obsession. Ok - it is understandable. Due to that, she was obsessed with finding the "murderer" of the show - ok. I get all of that. However, when she found the only person helping her, taking care of her, she hid all of her problems and ran to the stupid secondary ML instead of pursuing truth with the ML who was helping her all the time already - he even risked his life for her while the secondary ML had literally no advantage and there was no reason to choose his help. Still - she just left the good and caring guy, chose the help of a SML without any real reason to do so. It wasn't logical even for the sake of her hidden investigation. Then she destroyed life of the ML, he lost his house, he lost his job, he couldn't support his mother with dementia - all because of her wrong-doings. What's even worse, she did all of that perfectly aware of his troubles (magically discovering them by a coincidence on a way). Of course, he did not know anything about her but she knew everything about him and all she did was destroying, breaking, leaving all the people who cared about her for people who did not care at all and literally did nothing to her as compared to those who as I said - risked their lives a couple of times - literally - the ML took a hit with a knife, attacked a professional boxer just for her sake when she was hurt by this boxer, saved her from disciplinary comitee a couple of times, he became her friend, her only family she's never had except of her sister - but she was only and consistently behaving like a total bitch towards him.

So she did all of that, used the ML for pursuing her goal, did not even reveal truth to him even after she made everyone's life hell and then - guess what - she gets into trouble again, our ML magically discovers truth by a next coincidence and what - runs like crazy to help her. She's forgiven by everyone, she regains her friends, everything clears up, the murderer gets arrested, a dead sister magically lives and a man who should again - kick her in the butt afterwards, at least after helping her if he's the real angel, he still does all he can to help finding that sister for her... when she does literally nothing (!!!) - and happy end.

Totally shitty shit. It's just disgusting. Such dramas should be really taken down because they promote wrong values, wrong behavior, wrong examples under a wrapping of the romantic, self-sacrificing, heroic and "pure" love. Such a bullshit. It's really stupid, just wrong. Simply - do not watch this shit, please.