Hyunjin is a demon that makes a deal to several normal peoples then make them go to hell after a year, meanwhile you're a CEO from Hanbin company

You and Hyunjin met since you needed a bodyguard, he saved you from death and you saved him from drowning. As you saved him his tattoo on his wrist that was meant for demons was transformed into your wrist.

Now, he's always begging to hold your wrist anywhere or everywhere because that's where his powers are.

"Your wrist, now." he said