She is best known for her leading roles in Assorted Gems (2009) and Death Bell 2 (2010).
Ah-jin began her activities in 2003 with the television program.
In 2008 she starred in her first television film Get Up with Lee Min-ho, and movie A Light Sleep as Yeol Lin.
In 2009 she received an award for young Korean stars.
In 2014 she moderated Baseball Tournament at Suwon, Gyeonggi-do.