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Harold was a father figure to Yujin when he first brought him to the estate but after Yujin presented as an omega he started grooming yujin, touching him, and disgustingly telling him to remove his clothes whenever he comes over, the only reason he stopped short of raping him was cuz he was waiting for yujin first heat ... yujin knew that so he freaked out and sought help. Yujin and winnie ended up falling in love when winnie kept sneaking out to see yujin, so winnie ended up saving him from Haroldophile. But there's something that happened (I'll skip the details since its about a char that didnt appear much yet) and winnie was hospitalised for almost half a year, he kept getting pictures and videoes of yujin sleeping with other men but he refused to believe it saying it must be fake or a lookalike but when he came back he saw yujin sleeping with Harold on his bed and yujin looked at him and smiled before kissing Harold so after that he started believing all the pics and vids he saw of yujin before and he believed he got tricked by yujin. Timing wise, this was also very close to the time angie was conceived so he believed she came to be on that day (Remember he was in hospital for half a year so she can't be his baby)
Well this is the misunderstanding from Winnie pov (▰˘◡˘▰)
As for yujin, he was banned from visiting Winnie when he was in hospital, winnie was his whole world, he wanted to know whether he's alive or not cuz if he wasn't, there wasn't a reason for him to stay alive so he begged Harold to let him go see winnie and check on him, Harold then told him okay but he should come tell him in person, so he went to Harold room, and due to the scheming of other people, the tea yujin drank in Harold room was a drug that causes hallucinations and triggers heat, so while in that state Harold came to yujin and cuz his phermones smelled similar to Winnie, yujin thought he was winnie, this is when winnie came and saw them then left after Harold yelled at him but after that Harold freaked out and hallucinated as well seeing his first love in yujin then he got so scared he ran away before raping the drugged yujin.
Yujin woke up later to find himself thrown out of the estate and he found out he was pregnant, he tried to find winnie or see him cuz he heard he got out of the hospital but by the time he came to the estate he heard it was the engagement party of winnie and Evelyn so he called winnie privately and asked him if he was alright and if the engagement is a lie cuz winnie can't be doing this to yujin, but winnie refused to listen to him and even when yujin told him he was pregnant with his child winnie glared at him and asked whether the child was really his or not, seeing that yujin got so hurt that winnie is refusing to believe him and he ended up being thrown out of the estate. He had a hard life after that, eating from the trash and even whatever little food he found in garbage was sometimes stolen from him by others, having no choice he decided to sell his body for money before he starve to death, and he got taken by a man who seemed gentle but then he turned sadist as soon as they entered a motel and kept hitting and slapping yujin which caused him to hit the man till he fainted with ashtray and before he left the room he got tempted and stole the man wallet, which caused him to have prostitution and theft criminal records. So yujin really came to hate that winnie whom yujin always believed that will be on his side and believe him no matter what, has refused to believe him or give him a chance to explain. In reality Angie was really winnie daughter, yujin had snuck out once and went to winnie hospital room and it just so happened that it was winnie rut so they ended up having sex in hospital but winnie couldn't remember cuz of his rut ヽ(`Д´)ノ
He finds out like two chapters after he finds out the truth about their misunderstanding and put one and two together. Sorry, I don't really remember the exact chapter number </3. And uh no the redemption arc was weird af, I had wished the ml took another approach but oh well, and the end was rather abrupt in general and felt rushed, but well it is a happy ending. (●'◡'●)

Question, did winston's father actually raped yujin