Ken En Ken: Aoki Kagayaki S01E06 - Their Bond

Sisters Yin and Ning are joined by rebel forces Yuezhi and Rou. When they are invited to join the rebel army, Ning enthusiastically agrees, but worried for her younger sister, Yin is opposed to the idea. Ning resists her sister's concern for her. Meanwhile, Zhao reveals his concerns to Empress Cheng. Since the day of the tragedy three years ago, he has been unable to sleep. Furthermore, he is unable to forget what he's seen. During the night, Zhao struggles with his memories of the tragedy, so Cheng begins showing him around the secret passages of the palace.