Guest Stars Lee Byung Hun as Front Man Oh Young Soo as Oh Il Nam Kim Young Ok as Ki Hoon's Mother Park Hye Jin as Sang Woo's Mother Gong Yoo as Suit Man Park Si Wan as Kang Chul John D. Michaels as VIP Daniel C. Kennedy as VIP Lee Jung Hun as Banker Son Young Soon as Flower Seller Kim Min Che as Hairdresser