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She is the descendant of a medical family, and he is the guinea pig for testing medicine. The greed of the predecessors created an immortal and invulnerable monster. It has been living on drinking blood and eating raw meat for hundreds of years, living like a ghost and a monster. It wasn't until he met her that the monster realized that he was once a human! However, even though he was immune to death and injury, he could not prevent her from aging and dying. "The myriad prosperity in this world has nothing to do with me, but since you must bring me back to the human world, I will definitely return you a piece of beautiful mountains and rivers!" It turns out that reincarnation really happens in this world. It was already a thousand years later when I met her again. Things come and go and people change, only this heart is eternal. But still can't keep the lost youth. Every day and every year after that, he was searching... That was the thing he did the most in the endless time. Until.........