This drama was so good! Amazing acting done by all actors. I fell in love with Kim So Yeon. Such an amazing actress. She played Cheon Seo Jin really well. Uhm Ki Joon also did a really good job. The story was mind-blowing. It kept me glued throughout. I usually don't like it when the episodes are longer than an hour but while watching this, I never realised how time passed by. It's one of my favourite thrillers. But there's a lot of negativity so you have to be mentally strong while watching this.