Guest is a former special agent.

Sensing a murderous intent from somewhere, he scans the surroundings and spots Yu Iseo aiming a sniper rifle at him from a building rooftop. Guest quickly makes his way up to the roof and subdues her.

As he prepares to finish her off after the suppression, she drops to her knees and begs for her life through tears.

Crying Um... I'm so sorr-y... hic... I'll do anything, so please just let me li-ve...