Endgame Pairing is Not Obvious

ML has an ex girlfriend

FL has an ex girlfriend

FL has an ex fiancée 

ML is originally in love with the SFL before ending up with the FL

heavy love triangle that leans more toward the SML who the FL likes first

FL had a girlfriend who died

love triangle, ML ends up with the SFL

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

FL is divorced

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

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 has a different boyfriend at the beginning

FL is married

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

FL has an ex boyfriend

FL was married in her first life

SML is FL's first love before she falls in love with the ML

ML has an ex boyfriend

ML is married

love triangle, FL & SML are in love in first life

SML gets the girl

FL is married

SML has the childhood connection and an engagement with the FL

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.

love triangle, FL is initially in love with the SML

all the SMLs get the girl ;)

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

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

SML gets the girl

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

FL has an ex husband 

FL has an ex boyfriend

FL has the childhood connection trope with the SML

FL is engaged to someone else at the beginning

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

ML has an ex boyfriend

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

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

FL has an ex girlfriend

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.

ML has a fiancée

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

ML has a fiancée

FL is divorced

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 has an ex fiancée

FL is engaged to someone else at the beginning

ML has an ex girlfriend

FL is married to someone else at the beginning.

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

FL is married to someone else at the beginning

FL had a fiancée

FL was married

FL is a widow

ML dates another girl

FL was married in her original life, remarries him in her second, but ultimately ends up with the ML, ML has traits of a SML and doesn't show up until toward the end of the drama

ML had a fiancée who died

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

heavy reverse harem, 3rdML gets the girl

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

FL has an ex boyfriend

reverse harem, FL is supposed to marry SML at first

ML has a fiancée

love triangle, FL has an ex girlfriend

FL is engaged to someone else at the beginning

FL initially has a crush on the SML

FL has an ex boyfriend

heavy love triangle, SLS

FL had a first love who died

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

FL is married to someone else at the beginning

FL was married in her first life

ML has an ex girlfriend who is his first love

FL has an ex boyfriend

FL has an ex boyfriend

FL is married to someone else at the beginning

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.

love triangle, ML has a much smaller role than SML

FL is dating  someone else at the beginning

FL was married

FL is divorced

FL has a boyfriend and starts an affair with 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

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

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

FL is dating someone else at the beginning

ML is a widower

FL is in love with someone else at the beginning

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

FL is married and divorced from someone else at the beginning

FL has an ex boyfriend

ML was engaged

FL has an ex girlfriend

ML has traits of a SML/secondary villain

ML has an ex boyfriend

FL has an ex boyfriend

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