Dungeon Lovers.

A few years ago, a dark fairy nicknamed V linked up with the headmistress's daughter. V was known as a troublemaker because of his reckless acts and the exciting parties that he threw around campus. She had her doubts about him and felt skeptical that he was just using her for not only popularity but also for fake credit. He had good grades with the help of the headmistress's daughter, he made it to the final graduation test. And even still he wanted more. He begged the daughter to help him complete the test, but she could only do so much. When the day of the test arrived, he admitted to the instructor the whole situation. When he was sent to the Headmistress's office, she used her powers to banish him to the guarding position; upon being forced to guard the campus. He could only watch as the daughter broke his heart, ripping it apart before graduating. Leaving him to rot as a Lord.

Years later.
Sir, Oliver Springs. The Guardian of the Royale Dungeons has been hiding in the dark quarters of the castle, as he carries on with his normal day, he meets a man he's never once met. Lord, Vander the II. He's the Guardian of the Royale Garden, office, and now the dungeons? But that was Oliver's job!
Oliver was hesitant at first before he got to know Vander.
As secrets get spilled and tension rises, Oliver can't help but wonder who this mysterious Vander truly is.
There's a Rumor that the brooding knight is the dark fairy from the tale, but of course, V was just a story the teachers told to scare students into actually studying... right?