Park Yeon Hee always being labelled as a spoilt kid, one day she met a boy in London, he asked her why she cry. She told him that she always being bullied by her friends because her spoilt attitude. She can't stand jokes!

That boy told her,

"the way to not being bullied is be strong! Act though...i will give you this charm..." that boy give her a necklace, a blue colour necklace.

"Charm? How would this be my charm?"

"Believe me! You can be strong, put  the trust in your heart.."

"Okay!"

"So can we meet again?" Yeon Hee asked.

"Yes! Come to Korea..you will find me. Show me the necklace when you're see me even though we don't know each other..show me that necklace please... and i believe you're not a total loser anymore at that time..try search for me..be strong! Bye!" that boy rushed to his mother. They walked away.

"How am i supposed to search for you?ah..."

"Believe me! You can be strong, put the trust in your heart..."

Ten years later...

Yeon Hee come to Korea. Searching for the boy she want to meet...she enter Korea High School and all the students scare of her because she's a Jjang at that school, they call her Miss Troublemaker and then when she meet him, them and they!