One day before 'incident' happen...

EXO except Sehun and Kai waited in the cafetaria in SM office. There are also Super Junior members as well.

f(x) girls except Krystal came in. After bow each other, they talked about their 'plan'

"Sehun isn't here right?" Amber asked

"No, Sehun and Kai are in the school" Kyungsoo said.

"So what will we do to prank Sehun and Krystal?" Suho asked

Amber explained to them about her brilliant idea. EXO could only said "WOOOAAAAA"

"This is fun! Two teenagers in the room, locked.. th- OUCH WHY?!" Chanyeol got hit by Baekhyun

"You and your ert mind! I'm sorry" Baekhyun said and bowed to f(x) girls. The girls just laughed.

Super Junior members: Leeteuk, Kyuhyun, and Eunhyuk saw EXO and f(x) gathered together and they came to see them

"Aigoo kids, what happen here?" Eunhyuk interrupt.

"Annyeonghaseyo!" EXO and f(x) bowed together.

"Is this about your plan to prank the maknaes? Chanyeol told me" Leeteuk said

f(x) and EXO nodded and clapped together in respond.

Kyuhyun laughed "Krystal and Sehun, eh? I'll join!" 

"Me too! This will be interesting!" Eunhyuk said

So once again, Amber gave the explanation about the plan. Kyuhyun gave her thumbs up and Eunhyuk also Leeteuk just nodded in agreement.

"I'll go meet Soo Man sonsaengnim" Kyuhyun got up from his seat.

"For