Bad Guy (TV series)

In one night, Gun-wook (Kim Nam-gil) lost everything because of the Hong family. They took him in, believing he was President Hong's illegitimate son Tae-sung, and then cast him aside into the streets when it turned out to be a mistake. Years later, Gun-wook returns for revenge, taking down the Hongs and their Haeshin corporation step by step. The real Hong Tae-sung (Kim Jae-wook) and sisters Mo-ne (Jung So-min) and Tae-ra (Oh Yeon-soo) are all chess pieces in his impeccable revenge plan, but he never planned on meeting and falling in love with the smart and equally ambitious Jae-in (Han Ga-in).^{[7][8][9][10]}

• Kim Nam-gil as Shim Gun-wook^[11]
  • Kang Soo-han as young Gun-wook
• Han Ga-in as Moon Jae-in^[12]
• Kim Jae-wook as Hong Tae-sung^{[11][13][14][15]}
  • Park Joon-mok as young Tae-sung
• Oh Yeon-soo as Hong Tae-ra^[12][16]
  • Moon Ga-young as young Tae-ra
• Jung So-min as Hong Mo-ne^[17][18]

• Kim Hye-ok as Mrs. Shin
• Jeon Gook-hwan as President Hong
• Shim Eun-kyung as Moon Weon-in^[19]
• Ji Hoo as Lee Beom-woo
  • Chae Gun as young Beom-woo
• Kim Min-seo as Choi Sun-young
  • Lee Ji-eun as young Sun-young
• Kim Jung-tae as Jang Gam-dok
• Ha Joo-hee as Jeon Hye-joo
• Park Ah-in as Da-rim
• Jung Seung-oh as Uhm Sang-moo
• Jeon Min-seo as Hong So-dam, Tae-ra's daughter
• Song Ji-eun as Gun-wook's mother
• Song Joo-yeon as Song Joo-yeon
• Uhm Tae-goo as Tae-ra's bodyguard
• Joo Jin-mo

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.^[5]

Regarding the racy kissing scene between him and Oh, Kim commented that "Actually, I thought it would be good if it were steamy. I wanted to give this married woman with a child and a family a dangerous fantasy, or even a vicarious sense of satisfaction." He added that he prefers working with married women than single ones, saying, "The difference between shooting a melodrama with married and single actresses are they themselves seem to feel more comfortable and talk openly. It gives us a chance to become close and talk about this and that while not having to worry about getting involved in a scandal. In a way, married people are my seniors in life so I can learn a lot from them. I want to shoot more melodramas with married actresses from now on."^[2]

In the middle of filming, Kim received his draft notice for mandatory military service.^[20] He applied for a deferment in order to wrap up the shoot for the series, but it was not granted.^[21] Kim shot as much as he could (his scenes were reduced, and a body double was also used) until July 13, then entered the army two days later on July 15, 2010.^[22]