Oh Wan-soo, who married into the powerful Hwain Group, faces death threats. She crosses paths with Seo Do-yoon, a bodyguard investigating a friend's death that is tied to the Hwain Group. Together, they unravel Hwain Group's secrets tainted with desire.
Leaning on each other through thick and thin, a trio of best friends stand together as they experience life, love and loss on the brink of turning 40.
A detective with a strong sense of justice and ambition. One day, he receives a report from an unknown source that contains information about a large organization that commits heinous crimes such as drug smuggling.