Reply 1988 uses a non-linear narrative and you might not see it at first but some episodes happened long before a preceding episode.
To keep you on track, here’s a detailed timeline of the drama.
This section we will feature Deoksun’s loveline (Currently done up till episode 14).
We intend to have Sunbora loveline soon as well.
NOTE: THIS SECTION IS FULL OF SPOILERS. PLEASE ONLY READ IF YOU HAVE FINISHED THE SERIES.