The story begins with an immortal man whose responsibility is to stay near the forgotten river and monitor the activities of demons, punishing them if they cause any disturbances. However, living there alone made him bored, so he created a humanoid shadow to keep him company. Despite this, he was still unhappy because the shadow could only listen to him; it couldn't move, talk, or have proper facial features like eyes or a nose.One day, a devil offered him a deal: in exchange for something, the devil would tell him how to transform his shadow into a beautiful girl who could keep him company. The immortal agreed and followed the devil's instructions, but this led to chaos. The devil unleashed numerous demons as part of the deal, and as punishment for his greed, God separated the immortal and the girl.Amid their story, there are two other subplots involving troubled characters whose problems solved by the immortal. These subplots add depth to the narrative.The story has many beautiful scenes between the main leads, showcasing their amazing chemistry. However, the beginning is a bit dull, and I am not satisfied with the ending.