The story, without the spoilers.
Seo Yi-kang is the best ranger at Jirisan National Park, and she knows the mountain better than anyone. She can read a trail, a storm, and a lost hiker's fear, and she has rescued more people than she can count. Kang Hyun-jo is the new ranger: a former soldier who has just arrived, quiet and careful, with a secret he cannot explain. He has started seeing things on the mountain — visions of people who are about to die, or who have already died, in places he has never been. Yi-kang thinks he is strange. Then his visions start coming true, and hikers start disappearing on trails that should be safe. Together, the two rangers must search a vast, beautiful, and dangerous mountain for answers, while a killer uses the fog, the cliffs, and the forest to hide. Set against real rescue work, real weather, and the slow rhythm of mountain life, this is a mystery about a place that keeps its secrets, and about two people learning to trust each other when no one else will.
A little curiosity. A new favourite.
Start with the story, meet the cast, and make room for one more episode.