Prehistoric: Signing into the Chaos Clock at the Beginning

Su Nan traveled to the ancient world and became the disciple of Lord Tongtian; while listening to Lord Tongtian's sermon, he dozed off and awakened to a sign-in system; Sign in at the Saint Dojo and get the [Chaos Bell]. Sign in at Sanxian Island and obtain [Hundred Years of Cultivation]. Sign in at Sanhuang Cave and get [Xuanyuan Sword]. Not only that, Su Nan also has a young and beautiful master, and five young and beautiful senior sisters. Senior sister Ziyue, a master of swordsmanship! Second senior sister Mu Yao is a genius in formations! Third Senior Sister Chen Xi, the peerless medical fairy! Fourth Senior Sister Ye Qing, master of alchemy! Fifth senior sister Yunling, the ever-changing saint! And the beautiful master is the disciple of Lord Tongtian, Fairy Qiongxiao! With such a group of strong backers, Su Nan is not just getting wind and rain in this ancient world. His wise words are to just do it if you don't accept it. Anyway, I have many backers!