Jiang He was "kicked out of the house" by his grandfather, so he had no choice but to work at the place arranged by his grandfather. Who knows...
First day on the job: My boss is good-looking.
Day 2: My boss is a good person.
…
Nth day of employment:
Why is my boss a slime? It turns out those monsters and monsters really exist! It's just that I, a mere human, do not have an advantage over this group of non-humans in terms of intelligence or physical strength.
Everyone: ... You know nothing about your abilities