When the going gets tough, the tough get going. But what if sooner or later, we hit a ceiling and can't soar any higher? For Hoji Park, a young sports climber with grand ambitions, it’s difficult to accept that our limitations are set in stone. When her mother passes away from a tragic accident, Hoji begins to see a literal manifestation of her limits in the form of a dark barrier across the sky. Years later, together with former climbing idol Aseong Chae, Hoji begins the ultimate climb of all—the ascent past all limitations.