Kourin

Introduced as Shuurei's other servant at the palace. She was adopted by Taiho Sa after he saw her collapsed in front of his house due to the war eight years ago. She looks up to him a lot and was even willing to poison Shuurei and then sacrifice her life for him by drinking poison. After his death, she was sent to Taiho Sa's wife so she could live there. She traveled back to the capital with Ensei later in order to deliver information about the situation in Sa Province.

(Source: Wikipedia)