There needs to be more stars so I can give this 20. Been watching Korean dramas since 2012 and this is the best drama I've ever watched. It realistically and sensitively deals with a person with unique abilities and those who care for him, as well as showing the humanity of various people with mental illness. Oh Jung Se was beyond fantastic as a man with higher-functioning autism. He rocked every physical and verbal quirk without making the character cartoonish or ridiculous. The story also touched on almost every facet of such a person (resistant to change, overly honest, excels in one area, and many more). I sincerely hope Oh Jung Se gets an award for this role.

There is much more to be said but that might spoil the show for those who have not seen it.
Excellent and NOT your grandma's typical K-drama.