Arter Granedijn, a 16 years old third heir came from the distinguished household. Right on her birthday night a mysterious attempted murder shocked the whole household and forced the others to never speak about it. Her bed ridden mother, Her Grace, had a request to pass down a ring of the Head Master to Arter who had just turned 16. Things escalated quickly as many orders came for the inheritence. One day Arter meet a man dressed in all black, not being able to recognize the man's face; the mysterious man made his vow to always protect the third heir at all cost. Will their relationship as master and slave continues? or Will they work their way to achievements?All Rights Reserved