A Queen With a Ring (BTS FF) (Paused for a few months)

Can a simple ring change someone's life? The story is based on a university student girl named Y/N, whom the beautiful ring with a two-coloured stone was after. The ring wasn't like any other ring but had an unexplained negative energy in it, and the 7 knights from a different world were sent to her to prevent her from wearing it since it turned out to be the only way to bring the ring back to their world, yet it wouldn't be easy. The knights had to keep the secret of the ring, including their identiy of being a knight, followed by the king's orders. Soon or later, she will find out what was really going on anyway...right? Will they manage to save Y/N and keep the secrets secured? Or will they fail?