Responses
I think it doesn't feel exactly the same yet. MC has been taking those pills from his family to hide his condition. It seems likely those pills effect his yang quality. So it may be that MC still gives off a high level of yang, but not as high amount/quality so the ML doesn't know it's an exact match. Basically MC is like watered down alcohol. Still potent but the taste is a bit off and it takes more to get drunk.
Dude, ain't no way this big ding dong ahh demon lord did not recognized that the beggar he fucked way back is the current beggar his fucking right now like dude you felt the same yang energy, how do you not?