It sounds like you're looking for dramas with different misdirected attractions that the characters have to sort out? I share your liking for Wedding Impossible, Don't Dare to Dream, and My Lovely Sam Soon, so I hope I'll be able to mention a few dramas you'll enjoy.
Here are two dramas with chains of unrequited love that I don't see on your watchlist:
1. A Gentleman's Dignity: Four male friends adulting in their forties.
1ML likes 1FL
1FL likes 2ML
2ML is unaware of 1FL's feelings and has a somewhat committed thing with 2FL
2ML's baby sister 3FL is deeply attracted to 3ML; she's 17 years younger than he
4ML is addicted to flirting, leaving his chaebol wife 4FL feeling unappreciated
2. Sweet Stranger and Me: The characters orbit around the 1FL.
1FL is clueless about 1ML's motives and feelings
2FL angles after any man 1FL is close to
2ML likes 1FL
2FL and 2ML have some personality characteristics in common
Sometimes the phrase love square is used to describe people not knowing the true identity of the person they're in love with. Here are a couple of dramas with that kind of love square. (It's just a coincidence that Park Min Young is the FL in both!)
1. Healer: The FL doesn't know the ML's secret identity, and confides in his fake persona while falling in love with his hidden persona.
2. City Hunter: I see this is on your Plan to Watch! Another drama with an ML who has a secret identity.
LouM:
