Ei, Sei

Emperor Gaojun's attendant. He is a bit callous when talking to Shouxue but nevertheless treating her with respect and changed later on.

[Spoiler] Formerly known as Que Er, who was orphaned when his mother committed suicide, and was tricked into a life of a male prostitute after trying to become an eunuch. Running away, the young Gaojun sheltered him and took him in as his attendant, and gave him his new name. [/Spoiler]

[Spoiler] In the novels, it is revealed that he shares the same biological father as Shouxue, making them half-siblings. [/Spoiler]