I'm in a Different World, but I Become an Adventurer's Agent

Luke, a former agent, accidentally traveled to the magical European continent during the Renaissance. With his past life experience, he single-handedly created the "agency company" of this world. Those down-and-out adventurers transformed themselves after "signing" with Luke's company, killing the most terrifying bosses, endorsing the best-selling weapons and equipment, and becoming the most anticipated brave "stars"!