A world where beast-humans (suin) and humans coexist. Dong-yi, a rabbit beast-human, hears the news that the Dragon King is gravely ill. He sees a government announcement promising an immense reward to the beast-human who offers up their 'rabbit appendix,' and so he applies. But the contract is strange...? He is required to inject that thing... from the snapping turtle beast-human, Lord Jaran, into his own body?!