Who can tell me the detailed story of this farce?

I haven't seen the first one, but there are movies in the last three.

"Seventy-two tenants" and "San Mao students' intention" are all stories about Lao Shang Hai during the Liberation War.

Seventy-two Changes tells the story of seventy-two tenants having fun in a miserable life.

"San Mao's Students' Intention" tells the story of many jokes made by San Mao when he fled to Shanghai and worked as a student in a barber shop. Later, I fought with a blind fortune teller and got love.

Xiaoyuelou tells the story of the reform and innovation of the Suzhou time-honored "Yuelou" after the founding of New China.