The Two Sisters aka In Cold Blood: 1x6

Episode 6

After ruining Hye Won’s wedding, Do Eun plots another scheme to bring her down with Kyung Ja. Hye Won and Ji Chang return home without going on a honeymoon, and Hye Won even sees Do Eun in her dream. While Myung Ae gives Hye Won a hard time at home, Do Eun sends a text message to Hye Won.