Li Guizhen sits in front of the computer in his office at Foxconn's Longhua factory in Shenzhen on March 6, 2014.[Cai Muyuan / chinadaily.com.cn]

Visitors are not allowed to enter most buildings, but Li Guizhen, a section manager of a production line of component moulding, led us into his factory where women were silently polishing the components by hand.

Li goes on rounds several times a day in his production line to check on workers and gives instructions to the moulding team. They make the frames for PC screens for brands like Apple and HP.

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