Jeong Seo-yeon (Cho Yeo-Jeong) and her family suffered from violence abuse from her father. She left their home and start a new life with the man she loves to pursue her dream life. However, this happy life of her ended. She struggles to find any happiness in her life. She lost her hope to live.
At the lowest point of her life, she happens to come across 9.9 Billion. This large sum of money can change her life. She does whatever she can to ensure that she can hold on to it without anyone taking it away from her.
Meanwhile, Kang Tae-woo (Kim Kang-woo) who is an ex-detective, tries to uncover the truth behind his brother’s death which he believes is related to the 9.9 Billion.
What story will unfold?
Will Jeong Seo-yeon be able to hold on to this sum of money and transform her life totally?
Is Kang Tae-woo able to uncover the truth behind his brother’s death?
What will happen between Seo-yeon and Tae-woo?