The World of the Married (Korean: 부부의 세계) is a South Korean television series starring Kim Hee-ae, Park Hae-joon, and Han So-hee. Based on BBC One's drama series Doctor Foster written by Mike Bartlett, it tells a story of a married couple whose betrayal of one another leads to a whirlwind of revenge, grief, forgiveness and healing. It aired on JTBC on Fridays and Saturdays from March 27 to May 16, 2020.

With its final episode reaching a nationwide rating of 28.371%, the series became the highest-rated drama in Korean cable television history, overtaking Sky Castle. It also recorded the highest average rating for a drama on cable television, with an average rating of 18.829%. Although the series was criticized for its portrayal of sex and violence, it received critical acclaim for its screenplay, direction and acting performances, with Mo Wan-il winning Best Director and Kim Hee-ae winning Best Actress at the 56th Baeksang Arts Awards.