According to Youku's video, dorri is the protagonist in the online animation Nine Days in Xuan Di and its derivative works. Originally an ordinary student of Gold College, he accidentally won the first achievement "Nine-day Xuan Di Tactics", and then traveled around the Xuanwu world as a mysterious "Silver Tiger King" to punish evil and promote good. The online animation "Nine Days Xuan Di Tactics" is a series of works produced by Youku and Ruohong Culture, and it is also the volume of the spring conference of Genkai-Youku Animation.