My Brother is a vampire

[Warning: [BDSM] "Chronicles from Arcadia" A fantasy novel in which Serf Jefferson is the protagonist. after the death of his twin brother Griffin Jefferson, Serf seeks revenge on his killer. Serf who is a person with a shy and fearful personality, becomes obsessed with Griffin's death and becomes a cold-blooded man who seeks power and revenge. this is how the novel should have been but, Ayato Sakamaki travels through time and ends up in the world of the novel "Chronicles of Arcadia" as Griffin Jefferson.