Seo Yigang is the best ranger at Jirisan National Park. She knows virtually everything about the area, including where to climb the mountain. Kang Hyeonjo is a rookie ranger at Jirisan National Park. He graduated from the military academy and was once an army captain. He has a secret that he can't tell anyone about. These two people become partners and they work to save people around Jirisan National Park.

Jun Ji-hyun, Ju Ji-hoon, Sung Dong-il, Oh Jung-se, Jo Han-chul, Joo Min-kyung, Go Min-si, Lee Ga-sub, Ju Jin-mo, Kim Kuk-hee, Kim Yeong-ok, Yun Ji-on, Jun Suk-ho, Han Dong-ho, Choi Won, Cha Woo-young, Jung Dong-hoo, Kim Do-yeon, Ye Su-jeong, Son Suk-ku, Kang Ji-woo, Uhm Hyo-seop, Kim Ki-cheon, Baek Seung-chul, Park Hwan-Hee, Ahn Jung-hun, Kim So-min