What Should I Do If My Fairy Friend Is Jealous of the Lonely King's Sister?

The mutual redemption of the coward and the loser finally reaches the missing ending. The chaotic scenes are a common regret for you and me. We have gone through several lives, coming and going by the edge of the sword. A sister, a reflection, an enemy, and a friend. Even if we are separated, we will meet again. (Dual heroines, dual perspectives, Spring and Autumn and Warring States, friendship, no CP)