Ehhh how can her memory be gone when he fully healed her? Stamina and the like also makes no sense she should wake up immediately. Some contrived writing to have it outcome like all this. It goes against world/character rules so yes I'll proclaim bad writing here.
Also as far as chapters go alot happens but also not really, girl who shouldn't have been left even near clearly evil character the sister knows is evil gets I dunno something'd and somehow he gets her out to the forrest with noone seeing how this happened or what he did (remember he's hiding how evil he is). Dragon finds him and brings him to MC (MC claims this was the plan to have MC killed but why would he leave her body in the forrest? He couldn't know the dragon would take her body to the MC. I assume he meant to leave her there to die but then why not off her and just leave her unconcious.).