Im Yoona, a girl who loves to play jokes and prank, 14 years old, new prefect in her school, has a weak heart. Kwon Yuri, a cold girl especially towards her junior, 15 years old, Yoona's senior, prefect, has a slipped disc.  "Don't run choding!!!" "You can't catch me~ *merong"

"Introducing So Nyuh Shi Dae's Couple Show~"   "The first mission is....."   "Palli,palli Yoona. We don't have time if you continuing eating. We need to win this!!" said Yuri.