Noah is terminally ill. However, right when he thinks that nothing in the world makes sense anymore, he finds out his doctor's secret: he is a demon. Noah might be sick, but he is not weak. After realizing that the world is even vaster than he could have ever imagined, he decides to find the secrets of this new world along with his doctor before it's too late for him. But being with an alluring demon is not easy. Noah must resist the temptation of falling in love with his doctor.