As someone with no life and translated the naver raws here is some spoilers
Sarang is about to start getting worse but towards the end they find a new medication and she gets better. The series ends on her 20th birthday
There is no romance it’s a friendship and family story
The last few chapters get dark with sarang feeling exploited and trying to end her life on her own terms due to her mothers betrayal and public sentiment
Yes the mom was messing with medication she was afraid if Sarang wasn’t sick the public would stop supporting her.
There is 205 episodes and I think 5 chapters for a side story with the parents
Also it is officially translated on WEBTOON they are one chapter ahead but it is pay to read


Guys read it on WEBTOON it is complete and free you only have to watch an ad
I can't believe this is completed. I wss reading on the french version of the app and it went on hiatus on chapter 143. I was desperate when it wasn't coming back cuz the english translation was too far away to read, this might be the best new of the day