In Pigear(18), Tanza calls to Hoon that if anything goes wrong because of the Mu and Jet, he's going to report to him. In Tanza's line, he seems to be the intermediary who introduced Hoon to Tanza.
In 14. A.E.(5), he's appeared. He calls to Hoon that he told him to do his best because this was his last chance, but Hoon mess up Mr. Tanza's business, so he lost his credibility because of Hoon, so he breaks the relationship with him.