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Taeyeon was born in the city of Jeonju, North Jeolla on March 9, 1989. She was trained in singing and dancing. Taeyeon was discovered in the 2004 SM Entertainment's 8th Annual Best Contest winning Best Singer 1st Place & Grand Award in the contest. In 2004, she was featured in The One's song "You Bring Me Joy" before debuting as Girls' Generation leader. She is a 2008 graduate of Jeonju Art High School and was decorated by the Lifetime Achievement Award of the high school.
Taeyeon became a DJ on Good Friend Radio, which she co-hosted with Super Junior's Kangin until he left on April 19, 2009. From then on, she hosted the radio show single-handedly. Taeyeon ceased her DJ duties from April 26, 2010 onwards.
She also contributed to a couple of soundtracks as a solo artist, singing the theme song "Manyage" ("만약에", "If") for the KBS2 drama Hong Gil Dong and "Deullinayo" ("들리나요", "Can You Hear Me") from the Beethoven Virus soundtrack. "If" became popular on various online charts, around the same time "Baby Baby" was released, while "Deullinayo" received the YEPP Popularity award at the 2008 Golden Disk Awards.
She was featured on Munhwa Broadcasting Corporation reality-variety show We Got Married as part of the third rotation of couples; she was featured with comedian Jeong Hyeong-don. When this news was announced on January 7, 2009, it caused an uproar among South Korean netizens due to the 11-year age difference between the two.
She also sang "Sarangingulyo" ("사랑인걸요", "It is love")with Sunny for the drama Heading to the Ground, and the "S.E.O.U.L." song with members of Super Junior and Girls' Generation.
Taeyeon is also a sub MC for Kim Seungwoo's talk show, 'SeungSeungJangKu' (Korean: 승승장구) on KBS, MCing alongside 2PM's Wooyoung, Choi Hwajung, Kim Shinyoung, and Kim Seungwoo.
On May 7, 2010, she had her musical debut as the main female role in "Midnight Sun", which is based on the Japanese novel "Taiyō no uta" by Aya Denkawa. The musical is about Kaoru Amane, a 17-year-old girl, who suffers from Xeroderma pigmentosum, forbid her to going out during the daytime. She keeps her hopes up by writing songs and singing every night at a train station. Taeyeon received good press for her performance. Furthermore, she learned to play guitar for her musical performance.
Taeyeon and her band mate Seohyun were cast as voice actors for the Korean dub of the 3D animationDespicable Me. Taeyeon dubbed the voice of the character Margo, while Seohyun's role is Margo's younger sister Edith.
