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
• Joo Min-kyung
• Jo Han-chul
• Go Min-si
• Lee Ga-sub