In Pigear (18), Tanza calls and tells Hoon that if anything were to go wrong because of Mu and Jet, he would report Hoon to Ivon. In Tanza's line, he seems to be the intermediary person who introduced Hoon to him.
In 14. A.E. (5), he officially appears. He's on some planet. He calls and speaks with Hoon, telling him that he told him to do his best because this was his last chance, and that despite this, Hoon messed up Mr. Tanza's business. As a result, he lost his credibility due to this incident caused by Hoon. Therefore, he decides to cut ties with Hoon.