Caught Between My Master and His Imposter

DramaBox synopsis

Cold-blooded veteran Cole becomes the personal bodyguard of Julian, heir to an old-money family—only to discover after a kidnapping case that the returned Julian is not human at all, but a deep-sea monster named Elio wearing Julian's skin, having consumed part of his memories and developed a pathological attachment to Cole. Cole cannot expose it, cannot escape it—he can only continue to guard this monster up close, gradually sinking between fear, desire, duty, and love.