Dai Congwu was not killed by Dai Congwen. Dai Congwu and Dai Congwen are the characters in The Scholars. Brother Dai Congwu is a big corrupt official, brother Dai Congwen is a clean teacher and brother is a big corrupt official. He may have done too much evil, got seriously ill, died young, repented before he died, and handed over his position to his younger brother, who used his position to severely punish corrupt officials.