Does anyone know who the couple sitting in the back are?

They're Cha Kyung Joo parents :)

Cha kyung-joo's parents? I was confused at first too lol like who are these random people

Ohhh right, I was confused too since they weren't drawn in detail

Lol... Ikr (≧∀≦) Even wooyoungs father eye was gone in the last panel