The ruthless Demon King, cast into the mortal world to face an emotional trial, finds himself in the body of Nathan—the 'useless' husband of the fierce warrior Sheri. While Sheri is targeted by the envious Empress, the Demon King uses his time-travel magic to protect her family from a massacre. He secretly dismantles Sheri's political enemies, providing a sanctuary of power for the woman he was meant to test. In this fated game, the 'Devil' finds that his absolute heart belongs to his human wife. Watch as the power couple takes over the kingdom. A sweet and high-octane fantasy romance. Happy ending follows the trial. Success is finding love.