Happy Mitan is sort of an unofficial prequel to The Deer and the Cauldron / The Duke of Mount Deer / Royal Tramp.

In Happy Mitan, viewers meet many familiar characters that appear in The Deer and the Cauldron / The Duke of Mount Deer / Royal Tramp like Chun Hua (Who is Wei Xiao Bao's mother), Hai Da Fu, Chen Jin Nan (Who still goes by Chen Wang Ren in Happy Mitan before changing his name to Chen Jin Nan), Feng Xi Fan (Who goes by Fan Xi Feng before he changed his name), Hong Er Niu (Who is Su Quan's mother), and many others.

The positive is that Happy Mitan is very funny. It is very slap sticks in its humour and it has many forth wall breaking moments. You will laugh out loud in many of the different scenes.

The negative is that it focuses on a lot of side characters that drags the whole series. Another negative is that the mix of slap stick comedy and the serious dramatic bits feels weird when it is mixed together in the same scenes. Like am I supposed to laugh or cry? It also suffers from being good for the first half of the series to being boring and a drag for the last half of the series.

I recommend those who are fans of the The Deer and the Cauldron / The Duke of Mount Deer / Royal Tramp to give this series a watch. While it is not an official prequel, it is done well enough that it feels like a real prequel.