You oh! sure. sorry oppa." and you walked out with a smirked on your face. 
*i hope this plan will work*

and you waited outside his room. After you heard Woohyun was taking his bath. You walked in his room and started your planned.
First you put an extra hard stick glue on his chair  and you put a letter on his desk. Second you took his phone, his room key and his wallet with full of money and credits cardin it. Third, you put an egg at Woohyun's bath room door and you also put a fake toy snake on Woohyun's closet

After you satisfied with your plan. You went out quickly as you dont want Woohyun to see you and you lock the door from outside and inside.

With a smirked on your face you walked to you room. 
*Sorry oppa. but this is for your own lesson. I TOLD you already! *

+++++++++++++++++++++++++++++++++++++++++++++++++++

[After 15 minutes]

Finally Woohyun come out. *KKEERRKK* the egg cracked on Woohyun head. "ouch!"
*WTF. where in the world this egg come from*
"hais~ i just took my bath and wash my hair. Now i must wash them again."

Woohyun when to the shower and wash the egg away.

Then he took a shirt from his closet and suddenly the snake come out. 'YYYAAAAA!!!" Woohyun were really shocked.

____________________________

(At Jaejoong room)
"who in the world shouted in this house" Jaejoong talked to himself.

(Doojoon)
"haha! strike one" Doojoon laughed.

"boooo!!' You surpised Doojoon

"ASDFGHJKL ! ya! Hyesun! " Doojoon had a mini heart attacked there. You giggle. "Enjoying yourself oppa?" "you bet!" Doojoon smiled. 
"haha! fine then. im off shopping with Mr.Lee. Enjoy" and you waved at Doojoon before you went outside the house with Mr.Lee.

____________________________

he move far away from the snake. but the snake doesnt move. So, Woohyun come nearer and nearer, and he realize that its was a fake snake. "hais~ why are you doing here" he throw away the snake and continue picking a shirt.
*Doojoon! you are playing pranked on me again? because of that drama. L0L! you such a kid*

Woohyun lie down on his bed. 
*oh~ wait! isnt Hyesun want to search somethings here? what is she looking for?*

"Hyesun~ah!! you can come in now, Im done!" Woohyun shouted from his room but Doojoon replied him . "Hyesun already went out with Mr.Lee"

*fine then.* Woohyun was going to sleep but suddenly he remember that he have a homework to do. He wake up and sat on the chair that you already put glue on in. Suddenly Woohyun felt something not right with it the chair. Its seem glue~ey.

"haaaa!! this not Doojoon pranked! this is Hyesun! hais~" Woohyun sighed. and that time he saw your letter. he opened it

________________________________________________________________

Dear Woohyun oppa. :)

Hope you enjoy the pranked i made for you, hahaha! and i already know that you and Jiyeon are couple! and i told you not to couple with anyone in my school.  but you did it. Why oppa? there's so many others school and cute girls there. Why must be my school. and why must be Jiyeon T.T

and dont think im stupid and dono anything what's going on. You should think twice before you do something. So, as a punishment. You will stick on the chair for a day? Maybe? or maybe more than one day? I dono. XP

you must think why i glued you on the chair? it is because i want you too study! your exam is coming soon. That's what Jaejoong oppa told me. and please dont make appa mad at you again with the grades.

ENJOY yourself in the room oppa. and study hard ! hwaiting !

PS; I took your phone and your wallet. ^^ I will go shopping with your money. so, dont be mad at me. this is your punishment. :D bwahahaha! 

                                                                                                                                                                                                                                 From your lovely sister:

    ♥  Hyesun  ♥              

________________________________________________________________________________

"hahahaha!!" Woohyun laughed by himself reading your letter.
*so, she already know. But how? *

"oh! wait! she took my money and my PHONEEEE???!!!"

"hais! I was going to but new shirts, new phone and use them for my date with Jiyeon again"  Woohyun pouted.
*and how im going to call for help now*

"i have to find my way out from this!! hmmmm......." (Woohyun start thinking a way to make him free)

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

hahaha~ sorry if the punishment is boring.

I dont want to hurt Woohyun! hehe~

btw, ENJOY and COMMENT :D