The story is about a woman who is Jung Seo Yeon played by Jo Yeo Jeong who coincidentally gets her hands on this 9.9 billion won or approximately $8.3 million in cash and there is this man named Kang Tae Woo played by Kim Kang Woo who will meet Jung Seo Yeon while he is digging the truth about his younger sibling's early death.

Meanwhile, Oh Na Ra confirmed that she is going to play the role of Yoon Hee Joo, Jung Seo Yeon's beautiful and affluent friend who has this high level of self-confidence. As someone whos has not experienced any kind of poverty, misfortune, and failure in life she generously acts then towards everyone. However, she will transform into a cold-hearted person when she is given the slightest excuse.

On the other hand, the actor Seo Hyun Chul will be the one to take on the role of Oh Dae Yong who used to be a good for nothing boss of this entertainment establishment. But despite this, he is a loyal man in the story.

While Shin Soo Hyun will be playing the role as a bartender Ji Ha Na who comes to like Kang Tae Woo after receiving help from him. Previously, Shin-Soo Hyun has shown her acting skills through OVAN and VINXEN's music video entitled "Snowflake" and her role as Min Ji on this popular web drama series entitled "The Reason I Can't Help But Like You."

Then soon after Lee Ji Hoon also confirmed that he is going to play the role of Lee Jae Hoon, who is the director of Woon Am Foundation and Yoon Hee Joo's husband who is great at putting on a show as a good husband.

However, despite his outer appearance that people always tend to look at, he is secretly a playboy. Moreover, Lee Ji Hoon will show a completely different style of acting that contrasts with this role as Min Woo Won in the MBC's drama series "Rookie Historian Goo Hae Ryung." "9.9 Billion Woman" is said to air in November that viewers should anticipate watching very soon.