Mu-Gyul finds himself becoming a rival of Jung-In for Mary's love. During this time, Mu-Gyul, not knowing the meaning of family, surprisingly falls in love with Mary who is combative, loyal, and spunky. He meets Mary, money becomes involved, and a 100 days of marriage ensues. When it appears Mu-Gyul will never get married a once-in-a-lifetime opportunity comes about.

Besides that, he's so unfamiliar with fidelity that the idea of a lasting relationship seems alien, strange, and a bit scary to him. Because of this, Mu-Gyul has a constant rotation of women in his life, not believing in any of them enough to consider sticking around. He also has trust issues from his mother, who's every bit as well-meaning, likable, childish, & unreliable as Mary's father. He doesn't talk much and only wants to make music. He is chic, cool, talented, and loyal, living a carefree bohemian lifestyle. Mu-Gyul ( Jang Keun-Suk) is the lead singer and guitarist for an indie rock band. Torn between having her father prosecuted for fraud or becoming a 24-year-old divorcee, Mary is somewhat relieved when Jung-In proposes that Marry spend 100 days of marriage with both men and decide with whom she wants to live. Unfortunately for Mary, her deadbeat father has already registered a marriage certificate on her behalf with Jung-In. She sends the pictures to her father's cellphone with the message that this is the man she loves and they've gotten married. Mary takes fake wedding pictures with her new friend Mu-Gyul ( Jang Geun-Suk), whom she just met over the last couple of days. When Mary hears of her father's plan she devise a plan of her own. One day, Mary's father proposes that Mary be wed to a man named Jung-In to pay off their debts. Without any special skills, Mary works odd jobs just to put food on the table and to keep from getting too far behind on the rent. Because Mary can't afford to pay her college tuition fees, she temporarily stops attending school. Her father always makes trouble as a failed businessman, but Mary loves him dearly, despite his faults. She looks like her late mother, but her hot temper comes straight from her deadbeat father ( Park Sang-Myeon).

Mary ( Moon Geun-Young) is a young woman with the energy of the sun. Release Date: November 8 - December 28, 2010.Director: Hong Seok-Ku, Kim Young-Kyoon.Revised romanization: Maerineun Uibakjoong.Drama: Marry Me, Mary! (International English Title) / Mary Stayed Out All Night (literal title).

Asian girl middle finger myary