As the synopsis says, the MC is always the other girl. Although she also seduces the ML in every life, it seems like he would fall for her either way and outwardly it is him forcing or coercing her into a relationship.

However, in each life, the MC suffers many injustices (even almost being r*ped or killed) under the nominal wife of the ML. And while having the MC as mistress, the ML keeps the relationship with his nominal wife (literally until the end of each story) because of various reasons. And I really don't agree with this: if you love someone, you wouldn't wrong them like this. He should either break up with his wife and only after that pursue a relationship with MC / or stay with your wife and don't entangle with MC.

MC is also at fault, but she's pitiful to the point of frustration, as she never breaks up with the ML after she's continuously wronged by/because of him and he does nothing😩. In the end they end up together and the ex-wife isn't even properly punished for her wrongdoings.