A "whited sepulcher" is a person who is evil inside but appears good on the outside, a hypocrite.
castle's a dungeon, a sepulcher.
And so, all the night tide I lay down by the side of my darling, my darling. my life and my bride, in the sepulcher there by the sea. In her tomb by the sounding sea.
Needing a moment to think, she wandered around the royal sepulcher.
“白冢(whited sepulcher)”是指内心邪恶,但外表优秀的人,一个伪君子。