My strength comes from you *akatsuki no yona x reader*

Y/n is the 1st princess of Kouka, older sister of the 2nd princess, Yona. A fact not many people knew. She had beautiful h/l h/c hair and gorgeous e/c eyes. She was beautiful, no, stunning. Though many people didn't see that, for they were enhanced by her younger sister instead.
Y/n trained secretly, learning hand-to-hand combat, sword wielding, archery, and so much more. While her sister stole the spotlight and pampered herself with jewels, make up, perfume, anything you could think of.
You may be wondering, if Y/n were so stunning, why did nobody notice her? As I said before, Y/n was secretly training, meaning she was away from the castle most of the time. The people of the kingdom soon forgot about her and thought Yona was the only daughter.
That all changed when Y/n left the castle, starting her own journey. Leaving behind three boys, who miss her as much as she does to them, and a confused sister, filled with emotion, yet longing for her older sisters guidance.
What will happen when a tragic event occurs and the group meets up again?
Will it be the same?
Come, let's find out shall we?