In the end, The section chief orders Jimmy to become Wo Shing's chairman permanently, establishing the society as a family enterprise, that his son will become chairman in the future.
Do you think the section chief told Lok the same thing? That his son would become chairman in the future. That's why Lok's son ran away from him, because he didn't want to follow in his father's footsteps. Is that why at the school Lok wasn't mad at his son for joining a gang.
~Laugh and the world laughs with you. Weep and you weep alone~