Jealousy. It was a feeling Mark never thought he'd feel since he had already marked you his. But then, Jung JinYoung came in the picture. He was your old friend. It has been a while since you last saw him, so of course, you wanted to catch up with him. You wanted to know what he had been doing for the past months. Because of your closeness with JinYoung, Mark had started to feel jealous. He had thoughts like, 'What if she falls for him?' and so on... What will he do?