She is a member of the Korean girl groupWonder Girls, which debuted under JYP. Lim lived in Hong Kong for 14 years. She can speak Korean, Cantonese, Mandarin and English. Originally, Lim was a part of 5-member group in training in 2009. While still in training, the group flew to China where they appeared in numerous variety shows performing dance routines and songs to showcase their talent to the Chinese audience. As the group had no official name they were widely known to the Chinese audiences as "JYP Sisters" or simply as "Sisters (시스터즈)". They were also dubbed by JYPE as the "Chinese Wonder Girls". However before the group could officially debut, two of their members withdrew leaving only three of members which included Lim herself as well as Jia and Fei Fei.
The January 22, 2010, she joined the Wonder Girls, after former member Sunmi put her musical career on hiatus. 
She still keeps in contact with her former JYP Sisters, Jia and Fei who have now officially debuted in a four-member group under the name of miss A.
In 2010, Lim made her debut with the Wonder Girls, a girl group managed by JYP Entertainment, with their comeback single "2 Different Tears" as a vocalist and sub-rapper of the group, after the member Sunmi ended her musical career with the Wonder Girls.