디시인사이드

The train schedule posted on Yerin's Instagram

You can see that this special album continues the previous worldview and story.

From the top

· Train Name: @GLASS → Initial album name

· Train Number: Number of albums (including specials)

· On Board Service: (Is this where the butterfly was caught?)

· Read Down/ Read Up: Indicates the 'release year and month' of each album, with A meaning morning and P meaning afternoon.

· Mile: ‘Release month and day’ of each album

· Station name: Album names so far

· Symbol: Indicates whether the train has stopped, and seems to metaphorically express the point of time travel.