Mr. Plankton
Kim Min-seokYoo Ki-ho 'Kkari' Oh Dae-hwanWang Chil-sung Lee Hae-yeongChae Young-jo Park No-gyeongSubordinate Kim Si-wooChae Seung-hyuk (Child) Jeong Seon-cheolEo Heung's Relative Yun Hui-CheolEo Heung's Relative Song You-hyunSung Hae-won Jeon Kwang-jinOh Man-soo's Son Chun Myung-wooOh Man-soo's Son Yoon Woon-yongOh Man-soo's Son Jin Yong-ukPerfect Gene Employee Song Jae RyongPark Sung-shin Jeon Chi-hwaPolice Officer Park Ha-joonChae Seung-hyuk (Teenager) Kim Jeong-hoShin Myung-su Ahn Chan-woongShin Myung-su's Secretary Lee Sang-heeJo Jae-mi's Mother Kim Do-hyeongHongcheon Husband Park Young-bokPro Laundry Owner Nam Mi-jungHospital Lobby Mom Shin Soo-jungJeweler Saleswoman Yun Bu-jinClothing Store Owner Lee Kwang-ikCustoms Officer Jung Ma-rinTrain Passenger Kwak Soo-jeongFish Seller Park Soo-ahJo Jae-mi (Young) Nam Hee-SooAdoptive Mother Mok Ji-suBong Sook's Employee Kaare Svejgaard OlsenTiblo Executive Jeon So-hyunMarket Vendor Lee Jae-wooAunt's Boyfriend Shim Hye-rimCellphone Store Clerk (Eps 9) Park Kwang-jaeBong Sook's Employee 
