Almost all characters in his chart do not perform any "work". For example, controlling Gui Officer? This is not "work": Si being strong in the Month wants to control Gui, but instead Geng comes to produce Gui.
Or may Geng and Gui controls Bing? Not possible to control, because Bing Fire in this chart environment is far stronger.
If you keep analyzing the work processes in the Mangpai system, then you will see that eventually no character performs any work. This leads to introversion and shyness.
Output Stars are interesting. When they perform work well, the person is a nice conversationalist. But here, Xu, Wei and Xu damage each other through punishment. I think he does not like to talk.
Jie Cai (Rob Wealth) that JR mentioned often leads to quietness, because it sits on a solid pillar.