Invincible Qi Refining

Ye Xuan traveled to the cultivation world for fifty years, stuck at the 9999th layer of Qi Refining and unable to break through. After awakening the Sign-in System and receiving a task to take on a disciple, he chooses Lin Qingqing, who is actually the reincarnation of the Demon Queen. Believing she has taken on a useless master, Lin Qingqing rapidly advances with Ye Xuan's secret help, resolves sect crises, and tames an Immortal Beast Fox as her second disciple. Her former enemy, Ding Min, attacks but is suppressed, joining Ye Xuan as his third disciple. The four master-disciples face down opponents across the Immortal Realm, while Ye Xuan stands just one step away from breaking through.