On the contract day of the Demon Academy, Song Shifan, who had a low self-esteem, was the only "abandoned son" who was not chosen, until the ragged Qiu Ye'an held his hand: "I choose you." Accompanied by the cold and protective companion, they graduated side by side at the age of 19. They exchanged merit coins and sword talismans by slaying demons, and tested each other's sincerity in the light of swords and shadows. But who would have thought that the partner who had been protecting him all the way would awaken the demon king's past life when he was deeply in love - Song Shifan's lifelong mission was to slay demons, but the one he fell in love with was the demon who deserved to be slain most in the world. The sword has been unsheathed. Does he want to kill the devil or protect his lover?
Purpose: When the justice of faith is opposed to the one you love deeply, what is the real "protection"?