A Scumbag Also Travels Through Time

Two scumbag students accidentally traveled through time while camping in the wild. These two people are scumbag in history, scumbag in chemistry, and scumbag in martial arts. How can these two people live in the post-travel world without losing the face of the people who traveled through time? Should he do something earth-shattering and change history, or should he live a peaceful life as a petty bourgeoisie in the world after time travel? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.