You all know what you put in the back.

(1)When I was in my second year of high school in Korean,
(2)In a literary work, Duju came out, so the teacher…
(3)Everyone knows what you’re putting in the back.
(4)That’s what they said.
(5)Of course, all of them.
(6)Prince Apostle of Silla
(7)But the teacher said, “Hey, you guys! You’re putting in grain!”
(8)So, the members…
(9)I put grain in the back and started whispering. So funny.