Lin Fan is swept into the Immortal Demon Continent and through relentless trials, ascends to Supreme Sovereign of the Demon Realm—until the cataclysmic Immortal-Demon War erupts. In a reality-shattering confrontation, the Supreme Sovereign faces Empress Longyue of the Immortal Realm in combat. Their clash tears the void, annihilates the Heavenly Dao, and sends both plummeting into the abyss. When consciousness returns, Lin Fan finds himself back on Blue Star—his original world. His shock deepens when he discovers his mortal enemy, Empress Longyue, has materialized beside him. The impossible unfolds. The Empress swears vengeance. She spurns his offerings, rejects his aid, despises his very existence. Yet mortality itself conspires against their ancient feud. From cosmic enemies to reluctant partners, from supreme sovereigns to ordinary people worrying about rent and groceries, Lin Fan and Longyue's journey proves that even the fiercest adversaries can discover love when cast into a mundane world. "Demon Sovereign, I will destroy you!" "I'd rather starve than take your charity!" "Demon Sovereign, might we postpone this month's rent?" "Lin Fan, let's buy this together!" "Darling, what should we name our child?"