Jin Ki Joo misunderstood Seo Kang Joon in ”Undercover High School”... ”Come to the counseling room”

*Contains synopsis and spoilers. Jin Ki Joo misunderstands Seo Kang Joon and tugs on his sideburns to draw attention to him.
In the third episode of MBC's "Undercover High School" that aired on February 28 in Korea, Jung Hye Seong (Seo Kang Joon)
In the episode that day, Jung Hye-sung asked Lee Dong-min (Shin Jun-han) about a school ghost story, and he seriously listened to Lee Dong-min's story.
I was listening. Lee Dong Min continued speaking, and Jung Hye Sung continued listening, but suddenly Oh Soo Ah appeared and tugged on Jung Hye Sung's sideburns.
Oh Soo-ah said, "You got me," and then asked, "Are you going to scam me this time?"
Jung Hae-seon cried out, "It hurts too much," but Oh So-ah dragged her out, saying, "Come here."
Oh Soo-ah told Jeong Hye-seong, "Tell me the truth," and demanded, "Why did you take Lee Dong-min's grandmother's ID?"
Jung Hye-sung was confused, but Oh So-ah said, "If I don't bring it, then it's over," and said, "Oh, I was almost fooled.
This is a serious problem," he warned. Jeong Hye-sung looked at Oh Soo-ah with a confused expression, but Oh Soo-ah told her to come to the student counseling office right after school and left.
In response, Jeong Hye-sung shouted, "I'm busy today," but it was no use.