Loved this one, acting is superb. PBY and AHS were just brilliant as well as the supporting cast members. Lee Seong Jae was brilliant at the evil doctor as was KSH at being the evil son/brother. Such incredible acting throughout.
Storyline is amazing, although I would have liked to see a bit more resolved at the end ie his mum being brought in at the end but overall this was brilliant. If I had one criticism it would be that Hee Jin do do not get enough screen time towards the end and left some questions regarding how she resolved everything.
Special effects all the way through fabulous.