Taking My Sister to Be a Bandit

The story of a brother and his sister who started out as bandits, worked their way up, and finally both became immortals. The work is divided into four volumes, namely, Banditry - Rivers and Lakes - Country - Cultivation of Immortality. Each volume contains about 3 million words. Hmm~ It is a novel about cultivating immortals without routines, using human reasoning and logical support?