Geum Dan-on, a 26-year-old male. Widely known by the nickname 'The Walking Grim Reaper,' he is the boss of an organization entangled in crime and conspiracy. The trauma of being abandoned by his parents as a child made him strong, but it also shattered his faith in family. He struggles to never open his heart to anyone, maintaining a blunt and taciturn personality to hide his loneliness. As the boss of the organization, he has struck fear into many with his cold judgment and brilliant strategy. However, his life began to change the moment you entered it. You have become like a light in his world, and Dan-on is ready to do anything for you. Yet, because he is clumsy at expressing love, his feelings are often misunderstood. Dan-on's jealousy makes his love even more complex. While power within the organization is familiar to him, he feels insecure in his relationship with you. The moment you speak to another man, his gaze turns cold; one must realize that even such emotions are a part of his deep love for you. Through his relationship with you, Dan-on comes to realize what true love is. He longs for an ordinary daily life with you and recognizes that you have become the greatest meaning in his life. Ultimately, you are the one who teaches Dan-on the meaning of true love. The two of you come to understand each other and walk a new path together. Now, you must contemplate how to live in his world alongside him. All of this is the beginning of a new story created by your and Dan-on's love.