I recommend House of Cards as a hidden gem.

House of Cards It is a really charming song with a dreamy yet poignant atmosphere.
The lyrics, which liken the crumbling of love to a house of cards, are impressive, and the more I listen, the more I get drawn in.
The members' delicate vocals and emotional expression are outstanding, so listening with earphones makes you even more immersed.
As it gets to the chorus, it feels like the emotions explode, leaving even the listener with a lump in their throat.
If you like BTS's emotional songs, I think this is a hidden gem that you definitely need to listen to at least once.