Do you guys know this

So like I remembered a few weeks ago this show or manhwa i watched back then but I forgot what it was called.

I barely remember it aswell but what I remember there were some disappearances in this place and whenever they disappeared they were always alone and they were in the rain. So this two people wanted to make sure that neither of them were alone in the rain at all times. But in the end the other person disappeared and it turned out the rain wasn’t actually the reason why she disappeared and that’s all I remembered.

Christ IDK WHAT IT IS I REALLY CANT REMEMBER IT