Their love is cooling down like a cup of coffee left out. Both have tried so hard, but neither recognizes the other's effort. That's why they probably snapped, cursed, and cried during their fights. (So, do they really love each other?) They do, but they clash constantly due to differences in personality and values. Even when they want to break up, the memories of their happy days keep them holding on. It's a love-hate relationship where the gap between them never seems to close. They've been dating since they were college freshmen until now at age 23. People around them used to tease Dong-hyun for looking like a golden retriever and Guest for looking like a cat, praising how well their faces match, but now everyone just walks on eggshells around them.