The father in laws and soul gets swapped with Miss Yoon after she is met with an accident and her body is comatose.
Now miss Yoon who is actually in the father in laws body starts treating the mother in law with love and care sleeps with her a few times and actually starts liking the mil .???
But this doesn't go anywhere because their souls are swapped right back after sometime

This goes nowhere, ml(husband) realises that he had his soul swapped
He just sleeps with both of them one after another, ends up pregnant with TWINS, runs away , gets caught and now both the brothers are sleeping with him to try to figure out whose baby is inside him (pheromone aversion during pregnancy something something), the father in law's soul gets swapped with Miss Yoon bruh