A key, no matter how gilded, is always forgotten once the door has been opened. A spy versus spy taekook au with some description of violence.

Archeologist Taehyung gives tourist Jungkook a tour of the House of Venus, an ancient villa in Pompeii that holds a secret from the past. 

Taehyung meets Jeongguk in a small 80s bar where time stays frozen, and can't bear the thought of leaving him behind forever.  Heave, is where we are together.