Cultivating Immortality by Taking Care of My Sister-in-Law

[Invincible, multiple heroines, cultivation, reborn] After transmigrating to an immortal martial world, Chen Mo becomes a scholar. His older brother is obsessed with seeking immortality and pursuing the Dao, and never returns from his quest. In the end, all he sends back is a final message: Take good care of your sister-in-law. But in a world of immortals and martial arts, where demons run rampant, how can a scholar take care of his sister-in-law? Chen Mo decides to take up his brother's sword and follow in his footsteps. Demons and monsters, one sword strike will cut them down!