He took over management of the Tongil Group, basing its management principles on the ideas of [[Patrick Lencioni]], author of ''The Five Temptations of a CEO''.<ref>[http://www.tongilgroup.org/eng/sub01/sub01_2.html Tongil Group: 5 Principles of Management]</ref> | He took over management of the Tongil Group, basing its management principles on the ideas of [[Patrick Lencioni]], author of ''The Five Temptations of a CEO''.<ref>[http://www.tongilgroup.org/eng/sub01/sub01_2.html Tongil Group: 5 Principles of Management]</ref> |