Yim Ae Ju manga
An ordinary high school girl, Seonu Lin is actually a saint holding the 'Jade of Bango', the power of ancient times. On her sixteenth birthday she obtains special eyesight seeing, and goes to school every morning with the harmless and lovely ghosts. One day, however, she has an inspiring dream, and that evening, she encounters a terrible evil spirit. She is shivering in horror, but in the very nick of time a handsome man she had only seen in her dream before hand appears to rescue her. He also releases Lin's 'Jade of Bango' power. His name is In-Mu, who says to her that he is her fiance, as well as her guardian. With other guardians coming to take his place as her fiance, what could possibly go wrong?