Gabriel fell into hell while on a sealing mission and was imprisoned and tormented by his nemesis Cain. He pretended to fall in love to wait for a chance to escape, but genuine feelings developed over time. When he raised his holy sword against Cain, the plot was exposed, and Cain’s near‑fatal wound awakened Gabriel’s past‑life memories — a thousand years ago, they had loved each other, defying heavenly law. Gabriel had his memories erased to save Cain’s life. Cain was reborn through the blood of his own heart, and together they defeated Lucifer, ending the millennium‑long war between heaven and hell. They retired to the human world and finally found happiness together.
