The Two Sisters aka In Cold Blood: 1x37

Episode 37

Sung Yoon keeps his promise to Hye Won and tails Do Eun to find evidence. Luckily, he follows her to the OB-GYN clinic Do Eun attends and discovers her fake pregnancy. After hearing this from Sung Yoon, Hye Won takes the evidence and confronts Do Eun to make a crushing deal.