 After he manages to arrive the first class, he finds that Yi Yan is actually a married woman, who offers Lao Dao more money to hide this fact from Qin.On the way back, Lao Dao is captured due to the lack of an identification of the first class, but rescued by Ge, a security official who was born in the third class.Lao Dao accidentally finds that the whole waste processing industry, the main economic pillar of the third world, can be easily replaced by technology – and it is only kept in order to provide jobs for those third class people.