Unwanted marriage drama

These don't fit your ask exactly, but they're close:

• One and Only - The FL does not love her fiancé. She will never love him because she's in love with the ML.
• The King's Woman - At the beginning of the drama the FL is in a relationship with and in love with the SML and pregnant with his child. The ML kidnaps the FL, holds her against her will and forces her to agree to marry him in order to save the SML. But the FL falls for the ML, more or less, later on.

Thank you both for the recs!