Hello! Here a few dramas that you might like:
-cheese in the trap: a romance drama but at its core totally a slice of life/coming of age story. Not laugh out loud funny but subtle moments of comedy or joy. You'll smile a lot.
-Go back couple: A definite "nostalgia" kind of drama where the main leads revisit their youth and see things in a different light than they used to the first time. LOL moments and a whole lots of tears too. Not a sad drama though.
-the reply series: Reply 1988, reply 1994 and reply 1997. Exactly what you're looking for though I've not watched them yet.
-Let's eat : though all protagonists are adults, have adult jobs and leave alone they don't really act in a mature way. We see all of them grow up and learn to face challenges in a mature and responsible way. Very little romance.
-Weightlifting faiy Kim Bok joo: has all the elements you listed. Very funny and endearing characters.
-Because this is my first life
-Fight for my way
-Incomplete life: no romance if I remember correctly.
-Twenty again: Older main leads.