My Childhood Friend Is A Boy !?

Oh Han Byul once have a best friend named hannie. Han Byul thought that hannie was a girl so she and hannie always took a bath together and hug each other. But one day, hannie suddenly move to China and Han Byul was left alone. She cried for almost 1 week because of hannie.

Its finally 2014 and Han Byul is now 17 y/o. She was just a normal girl and friendly with some other juniors and seniors when suddenly a boy named Luhan move in to her school and start to make some stupid prank over Han Byul and everyone starting to make fun of her. Why did luhan do this to her although she did not know who is him. Can Han Byul find her own answer behind luhan's trick ?