Royal Wedding

Being the heir of the Rosenthal conglomerate, Eugene van del Rosenthal is tasked to marry the sole heiress of their partner company in business, Sarah Goldsmith. Both adhere to the principle of loyalty to one's family, and so carry the task at hand. However, Sarah was not just a typical rich gal.

Apart from the knowledge of her family, she's actually a member of a secret order composed of highly skilled swordsmen and strategical analyst. The head of the order, (Black Falcon order) plans to assassinate Eugene's father as he was going against the policies and advocacies of the order in matters concerning business.

Select members of the order, including Sarah is given the important task to do the assassination. The twist doesn't end here. The killing must happen on the day of the wedding.