Help finding a webtoon

I'm trying to find the name of this one webtoon, it was about a guy who entered a harem in order to kill an empress. I believe the harem was in the underworld? And the empress had rad skeleton hands. I remember the art being super good which is why I'm trying to find it again.

The leaders of the harem were these two really buff dudes, and I remember one was really into sweets lol