It's disappointing he regains his sight. CN authors seem incapable of imagining a romance with someone who has impairment. They always find a way to "cure" impaired lead. At least this happens later in the story, and long after the FL is in love with him.

Afterward, the few chapters was describing about how she had missed her parents to the point where it was almost aching. She acknowledged that she loves that ML, she also recognizes that she is a person outside of just love, and that she needs her family just as much as she would need him. The female states, that she would not be the same person that she is if it wasn't for her family and she would not be a type of person who would give up her family just for one individual.

-Poisoned in place of ML, every month on 15th will experience extreme bone piercing cold, when close to a fire will feel like slashing knife on her body (luckily, ML's body/internal energy can ward off the cold so they be hugging all the time~)

-Stopped a dagger for ML, was stabbed/slashed on her palm, he can avoid but refuse to (maybe just to test her? Idk)

-Kidnapped by a male antagonist and he vented on her by whipping on her arms and legs 5-6 times, she endured the pain without crying out because the man is a sad*st who enjoys others' pain

-Kidnapped again and was fed a Gu worm by ML's biological mother and became a puppet, controlled by a bell, over times, the bell ringing can also cause unbearable pain

-As a puppet who can't speak up, she had to bear hunger one time cause no one notice (The ML usually barely ate too, or in her words, he ate like a cultivator, that's why he didn't notice)

like ML's mother, yes, that's right, we have 2 yandere characters here

I liked that she never forgot or gave up on returning to her family, is it sad for ML? Yes, but as she said, for her, love is a part of her life and she can't just abandon everything else that makes her who she is. Nice, I'm tired of the shallow love of typical protagonist with loving family who transmigrates and just goes "Oh, well, I have a brother to take care of my parents anyways."

In the last arc, the ML realized that the MC will leave once his favorability reaches 100 so he forcefully distances himself because he didn't want the MC to leave and at some point, the MC finds out. The MC is not in a rush to brush up his favorability because her going back is not a priority. In the end, the ML lets her go because he thinks that the MC is not happy with him as she broke down once saying she misses her family.

Prior to the MC leaving she wrote a lot of letters to the ML wanting to leave her presence until she comes back. The system gave the MC an exclusive gift pack for completing missions but I don't think it explicitly stated that she could come back to him.

The ML thinks that she's just humoring him and that she's never coming back so after the MC left, he ended his life which is what the ML thinks is his perfect ending without her. This led to a system error and some stuff in between which in turn, allowed the MC to travel both sides having the best of both worlds.

This part is where it feels forced. I don't understand how the MC expect the ML to live on without her when he has shown time and time again that she's literally his life. The MC gave verbal assurance that she was going to be back but for someone as paranoid as the ML, how can he believe that? He doesn't know about the system and although he has seen how she healed his eyes it still wasn't enough. The author showed so much of the ML's reluctance to acceptance of the MC leaving so it feels cheap to just insert in a "system error" to achieve the "perfect happy ending".

I think the saddest part is that we see ML learning about love throughout the story and finally having something precious but with MC's departure, it's like he's back to square one, having nothing left.

Although the MC did her best to love and assure the ML, it is difficult to get through the ML because their thinking is totally different. In this particular situation with this kind of ML, the fact that the MC left should have already been a bad ending.

MC's choice is not wrong but she should still face the consequences of her choices.

The author notes in the raws I read seemed to indicate that there was only one ending and that was how it was intended (HE.) You just get faked out for a second.