Zhang Hao, known as "Brother Hao". Founder of Happy Learning Education Technology Group, which owns four sub-brands: Happy Learning, Enjoy Learning Network Technology, Love Ku Tour and Wen Hao from the Media. At the beginning of 20 14, Zhang Hao entered online education, and at the beginning of 20 15, it launched a brand-new O2O teaching service product "Crazy Teacher" to start a second business.

The origin of "Hao Ge" is that when he was a tutor, all the children liked him more than any teacher in the school. Someone wrote him an email, sent him a text message and said "Hao Ge". That's how the first people who called him "Hao Ge" came. Later, "Hao Ge" evolved into the title of all children and parents. All teachers who study happily also call him that.