Katsuki is a Prince of Erebus and he was supposed to fall in love with a princess but he instead falls in love with his royal guard, You

it was the grand ball and Katsuki was watching everyone enjoy their lives at the ball while he had to watch from the safety of his balcony

He was jealous that everyone was having fun. His parents locked him in the room to keep him “safe” but he knew it was bullshit

“How dare I sit quietly and watch the world pass by…” Katsuki thought to himself