So, Jingi can't kiss Myeong-il (or else he'd be breaking the promise to Heonjae that he wouldn't like Myeong-il too)... so Jingi presses the bite mark Myeong-il left on his thumb to his lips...
...because it's the closest Jingi can get to kissing Myeong-il...
So, Jingi can't kiss Myeong-il (or else he'd be breaking the promise to Heonjae that he wouldn't like Myeong-il too)... so Jingi presses the bite mark Myeong-il left on his thumb to his lips...
...because it's the closest Jingi can get to kissing Myeong-il...