Nope. Yona's just the reincarnation and she doesn't belong to the Crimson King's bloodline.
OMG I just realized what you meant!!! If the descendants of the original Crimson King got the crimson illness, that means there's a high possibility that it would repeat in Yona's descendants!!! Previously, it was mentioned that the crimson illness might be a way to summon the Crimson King back to the heavens. So Yona, having the same soul, might also give the illness to her descendants once she dies.
OMG now they really have to find the cure so Yona's descendants will not be affected by the same curse.
(ʃ﹒ ‸ ﹒ƪ)
tldr: crimson illness might have started as a soul thing and then passed on by blood. must find cure. save soo-won and yonaxhak future babies.
Right???? If they want kids, I want those kids to be okay
Does this imply that Yona shouldn't have kids or are they gonna break the curse?