Two gripping series released on Netflix – 'Sirens' and 'Our Unwritten Seoul' – on May 22 and May 24. Both shows revolve around the story of two sisters – a set of siblings and a set of twins. While 'Sirens' stars Julianne Moore, Meghann Fahy and Milly Alcock, 'Our Unwritten Seoul' has Park Bo Young playing twin sisters. Here's our review.