Muhanmaryeogui Chobogeomsa

After Simon, the prince of the kindom of Ainz, lost his father and his entire family name due to the betrayal of a trusted aide, he was taken in by a knight as an adopted son. However, on one fateful day, the knight's entire family was annihilated and his sister became missing. In order to find his sister, Simon goes on a path of vengeance...

(Source: KakaoPage, translated)