i honestly don't know when they'll officially be together in the public eye as a couple, but I do know the answer to your second question, it's Shin's alter ego (his inner dark thoughts) you could say. So it's his thoughts but shown as a human version of himself. If you look at the floating version of Shin (alter ego) he looks way more confident and dresses more formally (I'd like to say more boojie) because he represents Shin's subconscious. I hope what i explained was correct, everything i said was from my understanding so it might not be 100% correct.
i see, i think you are right that explains alot ,i hope those dark thought go away soon pls the dude getting more and more dark thoughts honestly sad for him
i hope so too, Shin looks so depressed i just hope that everything goes well soon
pls when will they be together, and who is this dude who looks like shin and keep saying bad thoughts to him