Yoo Ji-tae as The Professor
Park Hae-soo as Berlin
Kim Yun-jin as Seon Woo Jin
Jun Jong-seo as Tokyo
Lee Won-jong as Moscow
Kim Ji-hoon as Denver
Jang Yoon-ju as Nairobi
Lee Hyun-woo as Rio
Kim Ji-hoon as Helsinki
Lee Kyu-ho as Oslo
Park Myung-hoon as Cho Young Min
Kim Sung-oh as Cha Mu Hyeok
Lee Joo-bin as Yun Mi Seon