At first, everyone gasped, then they started to laugh loudly.

Yoona first looked shocked by what Taeyeon had done then, she glared angrily at Taeyeon.

Taeyeon gasped as she was shocked by what she had done and she felt very guilty.

Taeyeon: Oh my gosh, I'm so sorry! I didn't mean it!

Yoona didn't accept Taeyeon's apology but instead, she stood up and slapped Taeyeon.

Taeyeon felt a stinging sensation spreading on her cheeks.

Leeteuk, who saw what had happening, stared wide-eyed at Yoona and Taeyeon.

Everyone was staring at Yoona and Taeyeon and they didn't know that their teacher was glaring at Yoona and Taeyeon.

Teacher: What are you two doing?!

Suddenly, everyone stopped staring at Yoona and Taeyeon and pretended to look at their tables.

Taeyeon and Yoona stood frozen as they said: No... Nothing!

Teacher: You two, come to my office now!

Taeyeon and Yoona had no choice but to follow their teacher to the office.

-At the teacher's office-

Teacher: Can one of you tell me why you two were fighting? 

Both Taeyeon and Yoona kept quiet.

Teacher: If none of you give me an answer, I'll call your parents. So?