Jongin and Kyungsoo have lived in the same building for months without noticing each other. Both are suffocating from their own lives. On a fateful, marked day, they find themselves stuck in the elevator of their ty apartment building. In their moments of bonding, Jongin learns why Kyungsoo was going for a walk to the nearest bridge, and Kyungsoo learns why Jongin was headed for the top floor that accessed the roof.

Idea from: Doksoo