Starting from the School Doctor: I Really Don't Want to Make Progress.

No system, no time travel. This is a progressive record of contemporary scumbags and scoundrels. When comparing the lower limit of human nature, the comparison is about who is more evil; when comparing the upper limit, the comparison is about doing good deeds and accumulating virtue. It just so happens that Hong Xing, the protagonist of both the upper limit and the lower limit, is pretty good at both.