a wave does seem like something Jongin would use to compare himself to. "They always come back, but each time it's different. And when you know the wave is just going to draw back into the sea, you let it be"

"But the shore's always there," Kyungsoo offers hopefully.
kyungsoo applying lip balm 
i never knew just what it was
about this old coffee shop 
i love so much [...]
all of the while, it was you

When the girl’s mom thinks her daughter is ugly because she’s fat. Kai hits something out of frustration while lay just stares at the mom in shock.