After years of torment and a burning desire for revenge, Kael finally avenged the death of his lover, slaying those who conspired in her death. But as he stood triumphant, his body couldn't withstand the pain anymore. Kael died a peaceful death as darkness enveloped him, only for his soul to be reborn in an unfamiliar world.

Kael finds himself reincarnated as a son of a noble, now named Jin. Born in this fantasy world where magic and beasts exist, ordinary people could become Soulbound Mages. Mages who bonded with Soul Beasts to gain their sigils and were able to harness magic, something Jin deemed supernatural in his previous world.

Still haunted by the loss of his lover and the question of his sudden reincarnation, Jin's quest for vengeance evolves into a race to uncover the truth about his reincarnation.

Unbeknownst to him, his reincarnation was by no means an accident, as he slowly realizes the dark truths of the world and the hidden machinations around him. His lover may not be as ordinary as he seemed she was to be.