Yona of the Dawn; Naomi's Story

What if I told you that Hak and Su-won were not the only two best friends that Yona had? And what if Hak wasn't the only personal bodyguard Yona had during her time in the castle? And what if Su-won was in love with someone else and that's why he couldn't return Yona's feelings?
Well, I'll tell you who that someone was. Her name is Naomi.

Naomi was once a lowly little orphan girl with no home or family to look after her. But that was until King Il and his queen found her and took her into the Crimson Dragons Castle. There she met Yona, Hak, and Su-won. And the four of them became the best of friends. Years later, at the age of 16, Naomi has become a personal bodyguard for Princess Yona along with Hak. It was the Princess's 16th birthday, and everything was going wonderfully. Until that night everything changed when Naomi walked into the king's chambers and finds one of her childhood friends murdering the king.