There will be a change to the existing checkpoint system on November 4th update.
This update adds the ability to save the most recent day.
On older systems, save was only performed on a 5-day basis.
So if you restarted the game, So if you start the game again, you could only start from the previous 5-day checkpoint (ex: day1, day6, day11 ...).
After the update, if you start the game again, you will start with the setting part of the last day(B). The 'DAY RETRY' button has been added to the ESC menu to allow the management part to restart its DAY (B) However, if you re-enter DAY, the progress of the day, such as encyclopedia, PE box, E.G.O equipment, etc., will not be saved. After DAY clear, you can choose whether to skip to the next day in the result screen (C) or to retry DAY(B). If you select move to the next day (C), the last day will be updated to the next day.
'Return to checkpoints' will remain that move to the previous checkpoint(A) with retaining the encyclopedia, PE box, and E.G.O equipment.
If you select Continue when the game ends during the management part, you can start from the placement part of the day you ended (B)