Before Gu Mo and Su Jin got together
"Classmate Gu Mo, I see your Yintang is dark."
"... Maybe it's because of the sun."
"I think you may be missing something in your life."
"... Something is missing."
"I'm missing."
"..."
After Gu Mo and Su Jin were together
"Hibiscus, do you want some candy for Halloween? I'll buy it for you."
"No more."
"??? Why?"
"Because I'm already very sweet, so I don't need to eat sugar."
"..."