The second Korean drama, that I watched. I love it and rewatched it twice, since. The story was really great and the robot things were so interesting, the male lead was really great in it, in potraying two (or three) personalities, also very very handsome. I like female lead and the chemistry between the two and I liked the other characters as well, the music was great and memorable, as well. I am glad for the cameo in Czech Republic, my birth country. Overall, a great mix of action, drama, romance and slight comedy. Reccomend to everyone.