I think that he's burnt-out, he's probably been so stressed because of all of the expectations he's been putting on himself. (Or at least I think)
Though, the stress probably made him ill, especially since he hasn't gotten much sleep either.
Shin jusy doesn't know when to take a break. (〜￣△￣)〜
yeah he truly goes so hard on himself!!! aiming for perfection always and forgettig that he's only human.... He can let go sometimes and enjoy his "sinful" wishes ...
It explains in the latest chapter on Tappytoon that it’s sude effects of the truth serum he took a while back
what's wrong with Shin now? is he seriously ill or just so stressed out by all what's going on and him having to choose and see his King with someone else beside him as a queen...?! (〜￣△￣)〜