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Kaiyin comes from a demonic family. He inherited the blood of ancient demon species and can obtain magic more easily than normal people. This powerful power also makes his fate more bumpy or cruel. Eventually, Kaiyin joined the Great Wall Guards. The teammates have always been extremely tolerant of this alien whose origins are unknown and who has lost all his memory. Because he was wearing a living armor, his teammates used "armor" to call him who had forgotten his name. This is where Kain's story begins...