Why Am I a Burly Sidekick?

Mao Guzhou never expected that after starting high school, he would miss the surreal life of middle school so much. Even less did he expect that, beyond once being called a robust australopithecus (Paranthropus robustus), he would have another connection to it. Under the influence of an unknown force, he wanders as if in a dream through the past and possible futures.

A cold, taciturn girl who sits beside him; a postmodern biology teacher who looks uncannily like Weimingzi and Ding Zhen; surreal middle school classmates reunited... What else could possibly make him feel entertained while surrounded by homework zombies?