Overview: Seo Yi-Gang is the best ranger at Jiri Mountain National Park. She knows virtually everything about the area, including where to climb the mountain. Kang Hyun-Jo is a rookie ranger at Jiri Mountain 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 Jiri Mountain National Park.