The Whole Class Is Rubbish: at the Beginning, You Relied on Swearing to Cultivate Immortality.

The entire class (including the teacher) traveled through time together, but they all became a newly recruited group of "miscellaneous disciples" of a small low-end sect (such as the "Blue Stone Sect"). What's even worse is that after testing by the sect, no one in the class has decent spiritual roots. They all have "waste spiritual roots" or "pseudo spiritual roots" and are regarded by the sect as the lowest level of coolies.