KIM Jong Dae a.k.a Chen a naughty boy. who is studies at XOXO High School. He always prank other stidemt. He also prank the teachers. But the most who get prank are his friends. That's why his friends call him as troll Because of Chen have 11 friends, so they made their own group. Their group named EXO. Nobody knows bout meaning of their group name expect them. They abit mysterios group It's near Chen birthday. His friends wanted to make a suprise birthday party for Chem to show their lobe to Chen