Multiplication, Division, Addition and Subtraction

Because of his father's sudden accident, Zhang Yuncang entered the company in advance to prepare for the succession. However, the business departments seemed to be inseparable, and behind Yongcan was a shady underworld organization. Yuncang and his mother, an orphan and a widower, were single and weak. It was easy to imagine how difficult it would be to take over smoothly. In addition, due to the struggle of various external forces, foreign troubles occurred for a while. Fortunately, Youlin was always by his side and never left. However, as relatives and friends passed away one after another, Yuncang's spirit became more and more sensitive...