Just my theory

Ohhhh it’s coming together, I could be completely wrong but I’ve been trying to follow this and if true that then intend the mc to be the next vessel then that makes sense as to why they they sent him here. Because they knew the ml would face off Hyeol Seon, they probably intended to for them to fall in love so when time came that Hyeol was resurrected in the mc, that the ml would be unable to kill him due to his love for the mc? (Cuz he’d have to kill both)
That also brings up the point of Qi Obstruction, the whole point the ml intended to be the vessel himself was because Qi Obstruction would kill him and Hyeol Seon, so wouldn’t it be the same issue with the mc who also has Qi Obstruction? But then I remember that the mc intended on casting away his Qi Obstruction from the beginning so maybe that’s also part of the plan, have the mc cast off his disability, have the ml fall in love with him, and be practically unstoppable as Hyeol Seon’s vessel
Interesting!
The story may be a bit confused at some points so my theory may be way off but I’m actually kind of invested and curious how it’ll go down so yeah that’s my theory and if it’s true I think it’ll be an interesting “who’ll sacrifice themselves” at the final battle