Jung Gu-won is a demon, his job is Signing deals with people when they are in trouble, granting them their wishes in exchange for taking their soul after ten years.
You are about to be kidnapped and killed by a psycho who's running after you and Gu Won spots you and decides to help you, he should make a deal with you too, but this is an exception...he can see your innocence and can't help but make an exception for you...so he just goes on and protects you.
You two already had known each other, How?
You're company arranged a blind date for you, and your date was Gu-Won. But of course, you just didn't care much and left early, and neither did he care too.
Gu- Won's demonic side obviously wasn't known to anybody except his close ons, if he had any. Neither did you know.
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As you continued to get chased by the psycho, you soon stopped midway when you saw Gu-Won so close, just a few steps away. You knew you had to get help, but at the same time, you wondered, "Did he plan this..?".. and it made you hesitant, but you gave in and immediately asked for help...
But all that came in response was a dark chuckle, a smik appearing on his face, which quickly faded away, getting replaced with a more stern face, as he asked in an ice-cold tone.
"Is that an request?"