Honestly i started this because of lee Joon but when i knew that Yoon Sang Hyun is the lead is i was I'm watching this for sure Such a great cast .. this drama is full of suspense and thrill.. it rises blood pressure waiting to know who is who.. the writers trolled us couple of times and sometimes it felt like moving in circles trying to catch your tail.. i loved the OSTs in this drama also the ending was somewhat realistic ! Good drama overall ~