Endgame Pairing is Not Obvious

FL has an ex girlfriend

FL is in love with her childhood friend at the beginning, then meets and falls in love with the ML, and then the childhood friend falls in love with her. She ends up with the ML.

FL is married to someone else at the beginning

ML had a former first love who he planned to marry until she died

FL was married 

FL does not end up with ML despite it indicating that way for most of the drama. The ending is open, but appears to be interpreted as the FL choosing the SML.

FL has the childhood connection trope and engagement with the SML, heavy love triangle

ML has the traits of a SML, and FL loves someone else for a long time first

FL has a different boyfriend at the beginning

love triangle, ML has a much smaller role than SML

SML gets the girl

FL is married to someone else at the beginning

FL has an ex

love triangle, SML is given scenes/tropes with the FL commonly given to the ML

heavy reverse harem, FL eventually ends up the SML for the remainder of her life in the past, despite still being in love with the ML and having his child

reverse harem, FL is supposed to marry SML at first

ML has traits of a SML, SML has the ML traits and the FL is much more drawn to him at first

FL is engaged to someone else at the beginning

ML has a boyfriend when it begins, and it's unclear at first who he'll end up with

ML has an ex boyfriend

heavy love triangle, FL has the childhood connection trope with the SML

ML is atypical, has traits of a SML or supporting character

FL has an ex

FL has an ex husband 

FL has an engagement with the SML, ML has traits of a SML

FL is married for most of the drama but ends up with the SML

heavy love triangle, FL is much closer to SML at first

heavy love triangle, SLS

FL is married to someone else at the beginning

love triangle that could go either way, FL has the childhood connection trope with the SML

At different points in the drama, FL marries the ML and the SML. When she learns she's pregnant, she's unsure who is the father. She eventually ends up with the ML who is the father of her child.

FL has a long term boyfriend at the beginning. By the end, it appears that she's starting a relationship with her friend, the SML.

FL is married to someone else at the beginning

ML has a fiancée

heavy love triangle, ML is atypical protagonist

FL has an ex

ML has an ex boyfriend

ML has a fiancée

ML ends up with SFL, despite having the childhood connection trope with the FL

FL is married to someone else at the beginning

SML has the childhood connection and an engagement with the FL

love triangle in which the FL initially meets, loves and has a stronger connection with one of the MLs, but ultimately ends up with the other

ML is still broken hearted over his ex boyfriend

FL is engaged to someone else at the beginning

FL is married to someone else at the beginning, love triangle

FL has a boyfriend and starts an affair with the ML

FL is divorced

FL has an ex

heavy reverse harem, 3rdML gets the girl

love triangle, FL is initially engaged and nearly married to the SML

FL has an ex boyfriend

ML has an ex girlfriend who is his first love

FL is married and divorced from someone else at the beginning

FL has a long time crush on the SML

FL is dating  someone else at the beginning

FL was married

FL loves SML for most of the drama, ML has traits of a SML

FL is dating someone else at the beginning

FL was married

FL is in love with someone else at the beginning

FL marries another man but ultimately ends up with the ML.

FL has an ex girlfriend

FL is engaged to someone else at the beginning

heavy reverse harem, FL is in love with someone else for a long time, ML is an atypical protagonist

ML has traits of a SML/secondary villain

heavy love triangle, FL is initially engaged to the SML 

SML gets the girl

ML had a first love who died, and at first it seems he's just settling for the FL due to her resemblance to his lost love

ML has an ex boyfriend

everyone is involved with or in love with everyone, endgame is not clear until the very end

FL has the childhood connection trope and expectations of marriage with the SML

SML gets the girl, FL is in love with and pregnant by the ML at the beginning

FL was married

ML has traits of a SML, and FL marries someone else first

FL has an ex fiancée

ML is FL's second love, and she marries someone else before ultimately ending up with the ML

FL has an ex husband

FL has a stronger connection with the SML at first, love triangle

heavy SLS, FL has a first love who is a ghost/in a coma and for a while it's unclear whether she'll have a second chance with him or choose the ML

SML gets the girl

ML is in love with someone else for a long time first, FL has traits of a SFL at first

SML gets the girl

FL is married to someone else at the beginning, ML has traits of a SML

heavy love triangle that could go either way

FL has a girlfriend in the beginning

FL is married to someone else at the beginning

all the SMLs get the girl ;)

FL has a boyfriend and is pregnant by him, ML has a fiancée, but they end up together

FL has an ex fiancée

FL has a long crush on someone and accidentally confesses to the ML while she's drunk. Her crush re-enters her life later on but she ends up with the ML.

FL has the past connection and first love with the SML (and actually only approaches the ML because she wrongfully believes he has the SML's heart transplanted into him)

ML had an ex-girlfriend he's still heartbroken over

FL has a fiancée and becomes ML's mistress

ML is in love with another woman at first

FL has an ex fiancée 

ML's ex-boyfriend returns and for a while it's uncertain which of the two men he'll choose

ML has a first love who returns