Traitor. Lang Qianqiu used to trust you, in fact he trusted you more than anyone. You two were best friends since childhood. He had never doubt you, not even once

But who would have thought it was his best friend that would kill everyone he love?

Lang Qianqiu would have never believed it, even if you were the only one who survived. He would have never believed you were the traitor, however he was there. He saw how your sword pierced through his father, you did not spare mercy as you left