Dr ji ..looks veryyyyyyyy old in front of husband ... both were asking revenge eith each other ruining own ndxother lives... ...as I saw 9 episodes . ...no one innocent in both cases...both equal ruining family life ......THIS IS TRUE SIDE SHOWED BY WRITER ND DIRECTOR OF RICH FAMILIES......ND IT'S TRUE ...GOOD STORY
My opinion is older/married woman who are actress delivers better emotions in these type of broken marraige revenge stories..plus producers won't take the risk to give the role to younger/unmarried actresses as they lack the seriousness knowing that kdrama is global.
You're probably referring to Sadakatsiz (2022) but this is The World of the Married (2020) which was also adapted from an English series Dr. Foster (2015).