"Chen ah, do you know that you have three smiles?" Hyori asked as they walked. 

He looked at her, puzzled.

"Three smiles?"

Hyori nodded earnestly like a kid trying to convince her Mom that candies are good for the teeth. Chen chuckled. Sometimes he couldn't help wondering if their ages were switched. She was more of a child than he was.

"Go on," he played along with her, but he was actually curious inside. 

"Well, the first one- What?" Hyori frowned because Chen had been grinning at her, trying to control his laughter. He shook his head, smiling apologetically. Hyori shrugged and continued as if she hadn't been interrupted.

"One. When you're happy, you show your really sweet smile," Hyori counted off her fingers. "Mhm," Chen nodded.

"Two. When you're sad but you don't want others to know because you don't want them to worry, again you show your sweet smile, but it doesn't reach your eyes," Hyori continued. There was a moment's silence. She looked at Chen and saw him smirking.

"Should I feel honoured that you have been observing me with such great detail?" He teased. Hyori turned pink and cleared . Still smirking, Chen asked, "May I know the last of my three smiles, Park Hyori-sshi?"

"The last of your three smiles; The way you smile when .." Hyori suddenly seemed hesitant to finish her sentence. They had stopped walking. Chen faced her. 

"The way I smile when ..?" He whispered, brushing her fringe to one side. They gazed into each other's eyes for a few seconds. Then, Hyori beamed. 

"When you look at me."