What's the name of the man who assassinated the queen in Princess Pearl?

Such as plot

Episode 46

When they were going to greet the queen, Erkang caught a eunuch in the imperial garden. This eunuch is the vicious killer that Erkang and others met during their escape. In order to protect themselves, eunuchs finally exposed the conspiracies and misdeeds of the Queen who framed Wei Zi and others several times. Ganlong was very angry when he learned about it! So he ordered the execution of the queen and sister Rong, but kindly took out a gold medal and pleaded for the queen and sister Rong in the spirit of "the greatest virtue in life is forgiveness." The Queen Mother and all the people present were deeply moved by her noble sentiments, and everyone also asked for mercy for the Queen and Sister Rong.