She does die but
Spoiler
She and the ML have a child or maybe two I'm not 100% sure and they get married and have a bitter sweet ending like yes she's happy but she won't She her child grow up （/TДT)/
Hmm don’t know how I feel about that haha
I can't say for certain what will happen in those 5 years except the fact she has a child this is all info from a commentor who read the novel the manhwa might change it if you go back enough you might find there comment but they commented near season 1 so idk how back you need to go cuz they went into basically an outline of the 5 years in the novel
Does she actually die at the end? Or do they find a way to heal her?