Responses
He knows from the start but feign ignorance since mc wants to lay low
He did suspect him to be J from the start but only able to confirm it on that erode dungeon, you can see the flashbacks he had with J when cha eui jae ask him if he hurts anywhere
On chapter 43, you can read it again. Lsy saying "i found you". That's when he confirms it that he's J
wait, since when ml knew mc is j? i thought he didn't know did i overlooked this part....