Responses
Nope. That wasn't even Jaeha's hand in the first place. If you carefully inspect the other pictures you will notice that this was actually Yosoeb's hand.
the hand is yoseob hallucination. You can fully see it here https://www.lezhin.com/ko/comic/another_secret/34?requiredCoin=3&target=charge-coin
im not liking that last panel.... is jaeha turning into one of those monsters that yoseob sees....