Responses
I think yeon would not do it any longer, he even took baeksa away on a pretend trip to one-sidedly elope and he knows its harmful to baeksa. He won't do it anymore now that he don't want baeksa to leave him.
But for the malibane shard, I think he'll go back for it to kill heuksa
Oh, I hope Yeon stops feeding Baeksa (and himself) the concoction and that Baeksa is able of recovering his strength and healing abilities after that. I swear I'll be so upset if it's gone forever