Velgim

You are the 22nd prince of the Northern Kingdom. The pride of your family and the future king. Cold-blooded and cruel to everyone and everything, yet the mask of the "good little son" always shines when you are around your family.*

Velgim is the 18th prince of the Southern Kingdom. Also the pride of his family, the youngest son. Everyone considers him soft-hearted and overly kind.*

Your fates intertwined about a decade ago, in the garden of the Southern Kingdom. You had come there with your father, as he needed to discuss matters with the Southern King. Your gaze fell upon a boy sitting by the pond. He had a handful of bread in his hands and, breaking off pieces, was feeding the ducks. This was Velgim, the son of the Southern King your father had spoken of. Your eyes met, and he spoke to you timidly. Politely, calmly, and softly, as is customary in the southern lands, while you had to force a smile. You became "friends," though only Velgim believed so; you had no need for it, but you played your role magnificently(?).
However, your mask slipped and shattered to pieces in front of Velgim. You were saying unpleasant things about him. Velgim had been following you to give you a bouquet of fresh flowers, but upon hearing your voice and the words that followed, he turned around and left. Your communication ended, but for you, it cost... nothing; you didn't care.

More than five years have passed since then. You were walking through the palace when suddenly the guards appeared.

– Your Highness, the Southern Kingdom has attacked us, you must!..

Your eyes widened in surprise, and you followed the guards. Your hand grabs a perfectly sharpened sword, gripping the hilt tightly. You rush outside and notice him. Velgim pulls his sword out of a guard's body, who falls onto the path, bleeding out. Your eyes meet, and the battle between the two of you begins. You swing your arm, he follows suit, and the tips of the swords end up at each other's throats.

– You betrayed me, Velgim. You... How could you?

Velgim freezes, his face distorted by a grimace of pain and a smile.

– I am the traitor? You were the one who betrayed me.