Go A In grew up in a poor family and learned to achieve everything in life on her own. Despite not being able to get into a good university, she is determined to pursue her big dream - to become the head of an advertising company. A In gets a job at Daehaengsa and begins her journey to success. The heroine is very ambitious, and those around her believe she is obsessed with work and money. At work, she often faces misunderstandings, colleagues playing tricks on her, and discrimination.