In 2009, Bae Zhuhyun was discovered during the audition of South Korea's SM Entertainment Co., Ltd. and officially entered the company as a trainee. On December 10, 2013, South Korea's SM Entertainment Co., Ltd. released pictures of its trainee SM ROOKIES project member Bae Joo Hyun through international social networking sites Facebook and Twitter, making their first public appearance on the Internet.
In August 2014, Bae Zhuhyun officially debuted with the female singing group Red Velvet. On August 1 of the same year, the MV for Red Velvet’s debut single "Happiness" was released and ranked on the MV weekly list of the Chinese video website iQiyi. On August 4, it officially released the sound source of its first digital single "Happiness", which topped the list of major music websites in South Korea. It also sold on iTunes singles in Hong Kong, Taiwan, Singapore, Malaysia, Thailand and other countries and regions. The song ranked among the top ten, and made its official debut on the stage of the Korean KBS TV program "Music Bank" on the same day. On August 6 of the same year, he appeared as a guest on the "Kim Chang-yeol's Old School" radio program on the Korean SBS radio station Power FM. On August 15 of the same year , made his debut at the "SMTOWN LIVE WORLD TOUR IV" Seoul concert held at the World Cup Main Arena in Sangam-dong, Seoul. On August 17 of the same year, with the song "Happiness", he collaborated with SISTAR's "Touch My Body" and Block B's "H.E.R" competes for the first place; on September 28 of the same year, he attended the "2014 Hallyu Dream Concert" at the Citizen Stadium in Gyeonggi-do, South Korea as a guest performer; from October 4 to 5 of the same year, he went to Tokyo, Japan to participate in "SMTOWN" IN TOKYO" concert, on October 9 of the same year, the MV of the song "Be Natural" was released on the video website Youtube. On the same day, the second digital single "Be Natural" was presented on the Korean Mnet TV music program "M! Countdown". Returning to the live stage, on October 13 of the same year, the sound source of the cover song "Be Natural" was released and officially released as the second digital single. It won the first place in the Korean weekly chart on China's iQiyi Music Chart and Yinyuetai V Ranked second on the weekly list, on October 15 of the same year, he participated in the recording of the variety show "Weekly Idol" which was broadcast.
In 2016, she starred in the online TV series "Female Employees of Game Company" and challenged her acting skills for the first time.