Born Jeong Hye-Seon, in Seoul, Jung Da Bin attended Yongdok Girls High School and Gongguk University. There, she majored in drama for two years. In Taiwan, she gained popularity in playing schoolgirl types, especially for her miniseries Korean Wave. Jung Da Bin's first breakout role was in the film Land of Ginkgo in 2000, in which she starred with Kim Yoon Jin.

In 2004, she starred in the Korean comedy He Was Cool, playing a high school girl.

In 2007 while staying at her boyfriend's apartment in Seoul, she committed suicide by hanging herself; she was discovered by her boyfriend in the bathroom, with a towel wrapped around her neck. While no apparent suicide note was left behind, an entry in her on-line blog shortly before her death indicated she was suffering from depression. Jung Da Bin's last diary entry read:

“Everything is so complicated. I get angry for no reason and I feel like I’m going crazy. It hurts so much that I feel like I’m getting sea sick. My head hurts so much that I start to tear. I was becoming a slave of my temper. I thought that I was losing myself, losing my identity… Then at that moment, as if I was getting an electric shock, I found peace. God came to me with love. He made me realize my importance and gave me courage. He lifted me up and he said it’s going to be okay. I’m okay”

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She was found dead the morning of February 10th, 2007, a few weeks before her 27th birthday. The Korean entertainment industry was shocked by the news. Many Korean media sources cited depression as the reason.

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