I, a Menial Disciple, Am Actually the Sect's Elder

Gu Changsheng transmigrated into a cultivation world and became the most useless menial disciple of Qingyun Sect. But he has a secret—he is the reincarnation of the number one sword immortal of the celestial realm ten thousand years ago. Activating the 'Max-Level Boss Returns System', he only needs to pretend to be weak for one year to recover his cultivation. So Gu Changsheng begins to seriously pretend to be weak. Sweeping the floor, he obtains the Immortal Emperor's cultivation method. Eating, he obtains the Innate Dao Body. Sleeping, he obtains the Chaos Sword Body. — Description from novelcodex.org