Shopping King Louis: this one is lighthearted to the extreme, so just focus on the fluffy haha
Sassy Go Go: This one is short and light, but also teaches about friendship, teamwork and has soome focus on studying too.
Love O2O: This one is chinese, and a bit longer than your usual kdrama. Also is cute.
(Only if you're into BL) Make It Right: The Series and Two Moons are good picks
Boss & Me: Another lighthearted chinese drama
Reply 1997: Actually all the Reply's series can count, althought I don't really know if the others are as light since I only watched this one.
Considering your list, I'd say you watch Sassy Go Go or Reply 1997, they focus more on a group of friends rather than one couple, althought the main couples are still well stablished.