Watch: Park Seo Joon Teases Kim Da Mi Over Her Bloopers In "Itaewon Class"

JTBC has released another behind-the-scenes look at “Itaewon Class”!

In the new making-of video, Park Seo Joon and Kim Da Mi are preparing to film the scene where they are doing a live video on Instagram. They rehearse their lines together, and he jokes about how people usually fuss with their hair when they’re on camera. He pretends to sweep away his non-existent bangs, and Ryu Kyung Soo laughs from the side.

They successfully film the scene, but the director asks them to redo it by improvizing a bit more. Kim Da Mi nods in understanding, but once the camera rolls, she has a hard time expressing her thoughts. Park Seo Joon jokes, “Her head is up in the clouds!,” and Kim Da Mi can’t stop laughing.

They try again, but Kim Da Mi talks too much this time, and Park Seo Joon cracks up at her mistake. On the next attempt, she bursts into laughter at her lengthy explanation, and he demands, “Are you from ‘Section TV‘ or what?”

He teases her for her continuous use of the word “lastly,” and she playfully hits him. During the final rehearsal, Kim Da Mi forgets one of her lines, and Park Seo Joon pretends to collect her floating mind in the air and put it back into her head.

Watch the full making-of video below!