I know this is late but i was thinking about Vice versa again - with JimmySea new series and all, and I suddenly realised: 'Wow. This is actually psychological thriller/horror.' 

HEAR ME OUT!

Your lifelong friend suddenly changes personality, quits his job (THAT HE WORKED SO HARD TO GET), cuts you and all his other friends out of his life and becomes a hermit (basically) and you have no idea what happened. Then a full year later he reverts back to himself, still with 0 explanation and life just moves on and also he has a celeb boyfriend now. 

The body swapping thing is already a horror element that was kind of explored in the series so I'll not go too deep into it. 

I also keep thinking of that boss of talay who also was body swapped and was like...younger than him...very sad actually.

But at least we have JimmySea chemistry to distract us :3

I just finished watching the series and let me tell you, I feel just like that. For me, the worst part is that Tess was the only one of the MC that made no effort to keep the other person's life in track. He is so selfish. 

Imagine going back to your life and finding that everything you worked was destroyed. It's a nightmare.

Then imagine not being able to go back and realizing you are stuck in another universe, away from everyone you love.

So, I agree with you, It's horror in a cute package.