When an unidentified hiker is found deceased in the Florida wilderness, authorities release a sketch. Multiple hikers call in claiming to have met the man. There's only one problem – he never told them his name. It would take two years, thousands of devoted internet sleuths, and a miracle of science to identify him, and that's when the trouble really starts.
Go Hae-jun runs away from home, while Baek Eun-yeong, a troubled student, ends up living in a tent with nowhere else to go. The two, who met by a twisted fate, end up living together in an abandoned old dormitory. Both hate the dormitory and each other, but with nowhere else to go, their difficult journey begins.
As a deadly virus ravages the world, Dr. Martin Lowery embarks on a mission to reach test site ATU327A, a research hub deep in the Arboreal Forest. The arduous journey, guided by park scout Alma, is set back by a nighttime attack that leaves the two bruised and shoeless. When they run into Zach, a man living off the grid, they gratefully accept his help. Zach’s intentions aren’t exactly what they seem, however, and a path out of the forest and into safety quickly fades as the line between myth and science blurs.
Dongju wants her boyfriend Sunggon to leave her house. Contrary to her expectations, Sunggon obediently packs his stuff and looks for a new apartment. To get the good old feeling back, Dongju and Sunggon climb up the mountains and set up tents, but unexpectedly get attack by an unidentified man.