Okay, so my two theories: 1. Hyun-su's monster alter ego / shadow self I think has grown to actually have feelings for Eun-yu, his monster / shadow self stilled allowed Hyun-su to save Eun-yu and saw how she wanted Hyun-su to be more confident and not take peoples shit - which is what his monsterself is like. I dont think Hyun-su has lost all his humanity either - if anything they seem very symbiotic now, his shadow / monster self almost worries about "his humans" condition to make sure he rests, like in that last episode 2. Second theory 😂 Eun-hyuk - again, I dont think his humanity has gone, when you 'monsterise' in Sweet Home, each monster character is a personality trait or characteristic of the human. Eun-hyuk showed incredible patience, self control and self sacrifice as a human along with a deep resentment for "the evil" or monstrous beings whether they be human or not. So I think he has mutated into almost the most evolved / powerful version of his characteristics that I listed, hence the other monsters being scared of him, his resentment for "monstrous qualities" almost making him the monsters cryptonite - if that makes sense 😂 SO psyched for seasin 3 🔥🔥🔥
If i am being honest Ah Yi? (However you spell) is kinda annoying.... i mean she is kinda bratty sometimes, and is basically the "new main character" i mean she does get a lot of screen time, and other stuff (i think) this is MY OPINION so no offense nor hate to anyone.
For me too she seems like a unnecessary character of the show . I don't know why the makers introduced many more new characters than focusing on the original ones .