Lee Hye Won, the general manager of Judan Arts Foundation, is Do Eun's sister, and Hye Won is engaged to Ji Chang, the perfect guy who loves her unconditionally. Due to their parents' divorce, Hye Won and Do Eun were forced to live separately during childhood. Hye Won followed her dad and was abused by her stepmother. Now that she can finally live happily ever after, her life starts to get miserable. She finds out that Do Eun, whom she has been desperately looking for, is shamelessly next to Yi Chul, Ji Chang's father. Hye Ji takes up the new name of Do Eun and blames Hye Won for the misfortune. Do Eun is having an affair with Yi Chul of JY Group, and her plan of becoming his wife gets interrupted as Hye Won gets in her way as the daughter-in-law of Yi Chul. The two sisters have been living as strangers for 20 years, and now they meet again as the women of two men who are father and son. They have no choice but to fight for their lives cold-bloodedly. Until where will their tragedy go?

So Ri, the CEO of an online shopping mall, is the only child of Kwang Nam and Ok Hee. So Ri is ambitious, competitive, and independent. She started her online shopping mall with Ha Ru and Yun A, her friends from high school. Yun A is So Ri's friend, but she is also her rival in love. She has a crush on Ha Ru, and she pines for him hopelessly. But when she is with So Ri, Yun A is a completely different person and can be as sly as a fox. After getting a divorce from Ok Hee, Kwang Nam remarried Ha Ru's mom, Hee Ok. Ok Hee and Hee Ok used to be best friends, but now, they can't seem to figure out where everything went wrong. These three families, whose fates are twisted with each other's, continue on to face a wild and crazy future.

Internal medicine doctor In Ah believes hormones can control a person's health, personality, and even feelings of love. One day, the ideal research subject to test out her theory appears in front of her. That person is surgeon Seung Joo who was once the most excellent person in the world. But after suffering a car accident in which debris becomes lodged in his brain, he turns into an unforgivingly competitive person. After the accident, Seung Joo begins to obsess about only the success rate of his surgeries. The accident left him with abnormally high spatial perception, giving him the ability to simulate surgeries in his mind, and he becomes the star of his department. Meanwhile, after a misunderstanding causes Seung Joo to blame In Ah as the main culprit for having a ticking time bomb stuck in his head, he starts to torment her and ends up forcing her to leave the hospital.

Jang Go is a young man who brings joy and pride to his family and serves as a human rights lawyer for the socially disadvantaged. Mi Poong, a beautiful young lady who has excellent dance skills recognized in Pyongyang, fled the country with her father and came to South Korea. Sin Ae is also a North Korean defector who would do anything to survive. Therefore, when she finds out that Hee Dong is a rich heir, she marries him. When she thinks everything is going well with her plan, she runs into Mi Poong in South Korea, who knows every dark secret about her. How will they survive the conflict and love over their huge heritage?

During the Joseon Dynasty, Kim Yoon Hee (Park Min Young) disguises herself as a boy to support her struggling family by taking entrance exams for other students at Sungkyunkwan University. When the principled Lee Sun Joon (Park Yoo Chun) discovers her scheme, he unexpectedly helps her take the exam under her brother's identity and enter the university herself. They become roommates and classmates, with Yoon Hee befriending the playboy Goo Yong Ha (Song Joong Ki) and rebellious Moon Jae Shin (Yoo Ah In), while simultaneously developing feelings for Sun Joon. As she struggles to maintain her secret identity, Yoon Hee must navigate the challenges of university life and her growing emotions. This is a 2010 South Korean historical drama series based on a bestselling novel and directed by Kim Won Suk and Hwang In Hyuk.