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- Drama: Iron Daughters-in-Law (English title) / Indomitable Daughters-in-Law (literal title)
- Revised romanization: Boolgoolui Myeoneuri
- Hangul: 불굴의 며느리
- Director: Oh Hyun-Chang, Lee Min-Woo
- Assistant Director: Jang Hoon-Ho
- Writer: Koo Hyun-Sook
- Network: MBC
- Episodes: 113
- Release Date: June 6 - November 18, 2011
- Runtime: Mon-Fri 20:15
- Language: Korean
- Country: South Korea
For over 300 years house, three generations of a family live in the same home. They have their own stories.
The daughter-in-law of the 11th generation, Choi Mak-Nyeo (Kang Bu-Ja), leads her family with charisma. She is strict, stubborn and also childish. Before she was even 20-years-old, her husband died. Since that time she taken care of her family and family matters.
The daughter-in-law of the 12th generation, Cha Hye-Ja (Kim Bo-Yeon), also lost her husband when she was still young. she thought her fate to be the first daughter-in-law of this family. she is busy to manage family matters. her first lover suddenly shows up in front of her.
The daughter-in-law of the 13th generation, Oh Young-Shim (Shin Ae-Ra) is a positive and bright woman. She was adored by her in-laws, but for the past 10 years of her marriage they have not had any children. Because of this, Young-Shim has a hard time. To make matters worse, her husband has an affair and demand a divorce. Finally, her husband dies in a car accident. Young-Shim feels guilty over not bearing any children.
- "Indomitable Daughters-in-Law" takes over the MBC Mon-Fri 20:15 time slot previously occupied by "I Trusted Him" and followed by "Just Like Today" on November 21, 2011
|Shin Ae-Ra||Kang Bu-Ja||Kim Bo-Yeon||Lee Ha-Nui||Park Yoon-Jae|
|Oh Young-Shim||Choi Mak-Nyeo||Cha Hye-Ja||Kim Yeon-Jung||Moon Shin-Woo|
|Lim Ye-Jin||Kang Kyung-Hun||Kim Joon-Hyung||Yun Da-Hun||Park Min-Ha|
|Kim Geum-Sil||Han Hye-Won||Kim Soon-Jung||Kim Hong-Koo||Viviana|
|Kim Yong-Geon||Kim Dong-Joo||Lee Hun||Jeon Ik-Ryeong||Lee Young-Ha|
|Moon Se-Jin||Hyun Myung-Joo||Moon Jin-Woo||Park Se-Ryeong||Jang Suk-Nam|
|Kim Yoo-Ri||Lee Seung-Hyo||Lee Doo-Il||Seo Seung-Man|
|Im Ji-Eun||Jang Bi||Bang Jin-Kook||sous-chef|
Additional Cast Members:
- Kim Soo-Hyun - call center team leader
- Choo Hun-Yub - Ho-Sub
- Lee Mi-Eun - Kang Na-Eul
- Son Ga-Young - Jo Eun-Seo
- 2011 MBC Drama Awards - December 30, 2011