Looking for a Kdrama where the FL falls for the SML or some other guy, while all this time her true fate/love was meant to be with the ML. It can be like the ML falling/chasing the FL but she rejects while she chases after the SML who turns out to be a bad guy/wrong fit/rejected. Then the ML who always liked her, comes to her side and eventually wins her over. 

Not quite but close...

  • My Dearest - FL is planning to marry the SML who she has a crush on, the ML is chasing her and she keeps pushing him away, but ultimately SML ends up marrying someone else and FL falls in love with the ML.
  • Marry My Husband - FL is married to the SML who is a jerk, she gets a do-over via time travel and ends up with the ML who had a crush on her years ago.
  • Perfect Marriage Revenge - FL is married to the SML who is a jerk, she gets a do-over via time travel and ends up with the ML
  • At a Distance, Spring Is Green - FL has a long time crush on her childhood friend who is a playboy. She gets her heart broken, the ML steps in to help her, and she ends up falling in love with him.
  • Maids - FL is in love with the SML, they're about to married, and many things happen. It's implied at the end she stays with the ML.
  • Who Are You - FL is in love with the SML who she thinks died and is a ghost but he's actually in a coma., ML is chasing her, she ultimately ends up with the ML after the SML's death. 

FL falling for SML and chasing/dating SML, ML chasing/secretly love and protect FL, and eventually FL falling for ML:

All About Eve (FL and SML are childhood friends. ML is a man who falls for FL after they're meeting abroad on hmm maybe FL's heartbreak trip-later meet again in Korea)

Feast of The Gods (FL and SML are childhood friends before FL get lost and separated from her family. ML is a rival but has double identity as an expert chef who often help FL)

Hotelier (FL and SML are ex-lovers meet again as colleagues, ML is a man who fall in love at first sight with FL when FL impressingly shouted at the waiter on a restaurant abroad (while FL assigned to look for SML to take-over GM position). ML then back to Korea as long-term stay hotel guest while also plan to take-over the hotel)

Strong Woman Do Bong Soon (FL and SML are neighbors? often meet at police station as FL tends to get into violence problems. ML is FL's new boss who recruited her as a bodyguard after watching her superpower)

Weighlifting Fairy Kim Bok Joo (FL and SML are strangers but once SML helps FL making her fall in love at the first sight. ML is once a childhood friend meet again on sport college, also SML's younger brother)

FL loved / chased SML and eventually ended up loving ML.

Woo Ri the virgin 

Boys over flowers : all versions. 

Arsenal Military Academy

Boss & me

Consider watching classics like Crash Landing on You or Boys Over Flowers!