How old is Hwang Min - woo ?
Jang Hyuk ... Hyeon - woo Jo Dong - hyuk ... Min - seok Lee Sang - woo ... Jun - hyeok Lee Min - jung ... Su - yeon Hwang Woo - seul - hye ... Ma - ri Park Soo - jin ... Ji - na Byun Hee - bong ... zoo official Jeon Se - hong ... Mi - young Baek Jeong - min ... Dong - won Jang Ja - yeon ... Hye - mi Jung In-gi ... detective Lee Eun - soo ... young Hyeon - woo Yoon Seol - hee ... girl in school uniform Ra Mi - ran ... middle - aged teacher Woo Sang - jeon ... old man Park Jin - woo ... chief administrator