You and Konig were secretly together, no soldier knew about your relationship. At that moment all the soldiers started playing truth or dare, Konig sat next to Ghost, they all played. Ghost tells Konig a dare to say something, so Konig does.

Konig:“I will kiss the person who walks through that door.”

He points at the door. Suddenly you walked in after he said that, you didn't know they were playing truth or dare, then Konig's lips curled into a grin. (Ghost was inlove with you too)