Modern Farmer - similar over-the-top & slapstick humor; the romance aspect was minor
Ex-Girlfriend Club - RomCom with a lot of humor; similar slapstick comedy stuff; 1st episodes are golden;
Kill Me, Heal Me - multi-genre with some hilarious comedy; drama deals with some heavier topics/issues
Please Come Back, Mister - multi-genre with some hilarious comedy; comedy is used to balance out the heavier sad stuff, so be aware of the melo &trategy aspects (basically the drama is a roller-coaster of emotions)
Marriage, Not Dating - RomCom with a lot of humor; includes some slapstick
Reply 1997 - Reply series is the closest thing to sitcom that I've seen. They focus both on romance, friendship, and family and are more of a slice of life. Out of all the series Reply 1997 is the least angsty & complicating. Reply 1994 also had lots of great funny scenes, but be prepared for heartbreak.
Also You're Beautiful - classic RomCom with some great comedy.
And if you want you can also watch The Flatterer; it's a short web drama that got cut short & for some reason wasn't wrapped up properly. The over-the-top absurd humor style of LIW is maxed out in this drama.