Dong Seven was a disciple of the Snowdragon Mountain.
Yuchi Snow became pregnant with Yichuan's child (Ning) and they, then, began a journey back to the Ji clan of Swallow Mountain in Stillwater Commandery along with Yuchi Snow's brother Yuchi Mount. During the journey, they were attacked by Dong Seven and his followers due to Dong Seven's desire to rape Snow. Naturally, Ji Yichuan and Yuchi Mount fought to defend Yuchi Snow and the ensuing battle resulted in Yuchi Mount's death, Yichuan's Zifu being warped and Yuchi Snow and her unborn child being injured. White saved Yuchi and Ning by carrying them and running away with them.
He died in chapter 317 upon being tortured by Yuchi Xiyue.