[7][8][9][10] In analyzing his character Gun-wook, Kim Nam-gil described him as "an innocent but bad guy," saying, "You can't hate him because while his actions may be based on vengeance; he's actually lonely and is longing for love."

About portraying the pretty, smart and ambitious Moon Jae-in, Han Ga-in said she "accepted the role in the drama because I wasn't scared to brush off my goddess image from commercials."

Hong Tae-ra's mundane life is shattered when she falls for Gun-wook, and Oh Yeon-soo admitted feeling nervous about her love scene with Kim.

[22] Renamed as Black and Red (赤と黒) in Japan, it first aired twice on cable channel NHK BS Premium dubbed in Japanese.

[25] It was later broadcast in its original Korean audio with Japanese subtitles on the main terrestrial channel NHK starting September 4, 2011, airing two episodes a day from Monday to Thursday for a total of two weeks.