Aisin Gioro Yinxiang is the 13th Prince of Emperor Kangxi and an unfavoured imperial concubine. He is a close friend and confidante to Aisin Gioro Yinzhen (4th Prince) who later became Emperor Yongzheng.
During the princes' fight for the throne, Yinxiang became collateral damage and was sent into isolated exile for 13 years. His exile was one of the reasons why 4th Prince seriously decided to enter the throne succession fight.
(Source: MusicalVeggies at MyDramaList)
