Woo began her career as a fashion model in magazine and television commercials, and had appeared in minor roles in the films Herb (2007) and Private Eye (2009). She had been affiliated with management agency Yedang Entertainment in 2008, but switched to Oracle Entertainment in February 2009. Woo had been undergoing treatment for depression, having been under severe stress following a number of failed auditions. At the time of her death, she was on a leave of absence from Chung-Ang University where she studied French language and literature.　　Death　　On 28 April 2009, Woo was found hanged at her home in Jamsil-dong, Seoul, in an apparent suicide. Her body was discovered at 7:40 pm by her roommate. Prior to her death, Woo sent a text message to her sister saying "I'm sorry", and left a note in her diary that read, "I love my family. I am so sorry to leave early." Police believe that depression over her situation and fear of the future led to her suicide.