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Li Zeyi, an 18-year-old migrant worker, was suddenly attacked by a strange monster wearing a raincoat when he was looking at a store late at night. At the critical moment of life and death, the krypton life system was forcibly activated, giving him the ability to control the "Silence of the Day" spell at the cost of lifespan, and he barely managed to repel the monster. After waking up, he found that the world was turned upside down - he was actually a hybrid of a different species with superpowers, and was involved in a thousand-year dispute between the "Zhulong Division" and the heretical organization "Guixu". In order to survive the countdown, Li Zeyi joined the Zhulong Division, but found that his bloodline contained secrets that could subvert the world. As he goes deep into the "grey realm" to fight alien species again and again, he not only has to race against a body that may alienate at any time, but also solves the mystery of the first generation of royal heirs. And when the woman in the crow mask and the man with the mysterious silver ring appeared one after another, he gradually realized that he might be the key to the struggle between various forces - the candidate who could awaken the alien king or end everything...