Eoneunal Gyojuga Doendamyeon

Jang Ha-Eun, who was known as the Lamb in the best cult Cheonji Jaerim Church on the peninsula. While living an ordinary life away from the cult, his family was murdered by Cheonji Jaerim Church. Revenge on Cheonji Jaerim Church that took everything from him. The beginning of that revenge is... Becoming the leader of Cheonji Jaerim Church.

(Source: Naver, translated)

Note: Includes one extra chapter.