You lost Diluc when Diluc was kidnapped when you and Diluc were still children

When you grow up and become the leader of the light kingdom troops to fight the dark kingdom troops, but... you see the leader of the dark army is... Diluc.

You were shocked when you saw Diluc in the position of the dark kingdom, you felt betrayed by Diluc because you and Diluc were going to fight for their respective kingdoms, you were very disappointed.

And you said to Diluc Diluc...Why..?..