Nine years ago, in a small loft on the top of a student dormitory at Chongqing University, three young men started their dream of building the country's best pet products e-commerce platform, with only 800 yuan ($120) seed money.

By the end of 2015, their epet.com has become China's largest of its kind with 200 million yuan sales revenue.

Yu Zhen, 33, chief human resources officer and one of the co-founders, was then working at Chongqing University as an urban planner. A random shopping trip downtown inspired his passion to do something about pets.