Wait if i remember correctly is she the one character that has kind of weird disease that ...

That has to be a joke

Please

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no, it's another girl

What

what

No it’s not her

At a certain point, they encounter a gurl that has a disease that causes yin energy to accumulate endlessly in her body, which would eventually cause her to freeze to death.(yin energy = female energy = ice energy). Vasically, she's Elsa, except she didn'tget the cold immunitypassive Elsa got.
Now, the doctor(a female doctor) that was treating her encountered the disease once before, and tried treating that patient by having a martial artist with strong yang energy imbue the patient with yang ki(the martial artist is a shaolin monk. Yang energy = male energy = flame energy). The way they tried the treatment was kinda like how the right guardian imbued ki into yeo woon. The result was that the patient died by burning to death. However, the doctor observed that if the yang energy were to be initiallyintroduced throughthe vagina, it might have been possible to save her. So she asks yeowoon to do the treatment. That is, to fuck her back to health. Mind you, this happens about a month or so after MC and this chick get it on for the first time, and he decides to marry only her, and promises her the same. He actually refuses the request from the doctor, however the girl's father(who is 1 of the 5 strongest warriors in the region) begs MC to save her. Mun Ku was already conflicted aboutit, becauseshe didn't want to share, but she saw the potential from saving her, and also knew that MC is likely the only one who could, but after she saw the father begging, she actually convinces the MC to go through with it. Thankfully Nano tells MC that he is also able to give MC a vasectomy on demand, and guarantees that there is 0% chance he will get her pregnant. So he does the deed. Forcefullyat first, because Murim Elsa has gone berserk and tries to nuke the entire fortress they were in, so MC had to fight a little to get her to cooperate, by by the time the sounds got loud enough to be heard by everyone else, they were moans of pleasure. Also, so far while he promised to care for them, both Murim Elsa and MC decided that just because they had a one night stand doesn'tmean they should marry. so she is

The only girl, no harem... For now

Well i guess that's ok for now I'm not really a fan of harem and btw thats really the weirdest desease in manga lmao

I’m in awe , forcefully means rape right