First, others might be quite dissatisfied with the fast paced relationship of the two main characters, and the reason behind them getting together might look illogical at first, however once you read further and understand the ML's situation, you'll also understand how desperate he is in finding a possible "cure" to his illness.

Although the MC is too thin skinned, innocent, and dense? (Like he literally blushes everytime the ML do something sweet), however it was quite understandable when he wasn't exposed to any s*xual stuff and relationship since birth (he just knows there's Haitang that exist but never reads a story and he realizes that he finds man more attractive than woman). The first s*xual thing he encounters was having a one night stand with ML where he was half sober and just remember a little bit of what happened because he was drugged (like ML on top of him, how it feels, and then taking a bath together). Like literally, he was innocent af with no experience with relationship because he grew up like a monk and cares more for his health than those stuff (I mean if I'm constantly on the verge of dying because of illness, I'd rather spend all of my time reaching my personal goals, repaying and treasuring the people who took care of me, and trying to live longer than my body can). He also constantly misunderstood the ML "having no desire" because of the medical records the ML gave him which point out the he was quite unfeeling and asymphatetic to normal human emotions and bipolar. This points should be kept in mind if you're going to read the story.

She wasn't forced to get an abortion, but it's a valid complaint about the story. It's an extremely minor part of the whole novel and exists more to tie up the ML's issues than to make her a significant, well-written character. Her motivation for her original wrong-doing is that the head of the family set a rule that his children weren't allowed to have children outside of their marriage. Because she was having an affair with his son and got pregnant, the son was going to make her have an abortion, and the story presented this as her motivation for doing unforgivably terrible things, but never addressed whether the head of the family's rule was cruel and continued to treat him as a good person.

I think the problem here is that it was a rushed motivation given to a character who was just there as a plot device, and so the novel ignored all the questions it brought up. I think you COULD explain it as the rule was not that illegitimate pregnancies had to be aborted, but that they weren't allowed to happen in the first place, and it was the cheating s*um son who was trying to get her to abort it rather than the head of the family insisting on aborting pregnancies. But it doesn't say that.

You could also say that she could have chosen to keep the child without their support, and that either way what she did afterwards was still unforgivable, but it's still uncomfortable that the novel doesn't break this down at all. Personally, I read this part as another exemple of weak writing and I ignored it, since it's such a small part of the story, but it is the kind of attitude towards female villain characters that unfortunately occurs too often in novels like this and I'm just glad this was the only real instance this story.