Fairy, Please Contract With Me

On the day the fairy water fell from the sky, a flower sprouted in the cold underground prison. The pale pink flower soon became a baby fairy, and approached the boy in front of him. "Hey! I am a fairy. I'm happy to meet you. I’ll get out of here with you!” "Yes, let's go out together. Let’s get each other out of here.” The boy, who didn't know who he was or why he was trapped, felt a desire for the first time. “Can I stay by your side forever?” The boy, who grew up as an emotionless human weapon, now dreams of getting out of prison with the fairy. Through a single method. “I will be your soulmate. Let’s make a contract.” Original Webtoon: