I've been tryna find this manwha its uhh erm a demon king he wag given something like a ri...

I've been tryna find this manwha its uhh erm a demon king he wag given something like a ring it was green and uh it was actually for his uhm deck he put it in it glowed it gets stuck he goes out town he goes to a hotel ig someone breaks in it was an assassin the assasin saw him trying to break the erm green thing and I JUST WANNA KNOW