A Mortal Cultivates Immortality and Undergoes Seventy-Two Transformations

No system + no heroine + no background, a history of low-level people's struggle to become immortals. The protagonist practices the Seventy-two Transformations of Jingzhe, and can transform into various monsters and roam the world! In the beginning, he surrounded and killed his senior brother, and was forced to flee the sect and wander around the world.