He figured their talk is not working in their favor. He had a backup plan. He knew getting close or touching her in front of the camera will get both of them nervous and excited. He suggested they get close and she moved in. He said they would just touch their noses. She was smiling so lovingly when they approach each other and their noses naturally come together without any adjustment needed. He decided to surprise her by turning his face as if he was going in for her lips. She flinched and laugh at his move. It didn’t get that high. She is used to it. The only difference is they are in front of cameras recording them. They failed miserably. But their secret is safe. They succeed with Sukjin afterwards and Gary blurted out “If we knew, we wouldn’t have talked on our love!”