In a world filled with fame and mystery, famous detectives Yoona Lim and Kang Seulgi are well-known. However, when someone hires them to protect his endangered daughters, their lives change in unexpected ways. Committed to their job, they quickly get caught in a dangerous situation that tests and changes them in ways they never imagined.

Yoona, an orphan, suffered under a cruel man's care. Determined to escape, she worked hard to stand on her own feet. Destiny brought her back to Jessica Jung, a rich and famous actress, for a second meeting. They shared a deep connection, but six years set them apart in age: Jessica at 36 and Yoona at 30.   Using Jessica's wealth an

Yoona's life took a sudden turn when her parents threatened to cut off her financial support for studies unless she took her law studies seriously. Despite this, she now faces a different kind of obstacle in the form of her roommate's stepmother, Jessica, with whom she is having an affair, and Jessica's stepdaughter, Jennie, who seems to be drawn to Yoona like a magnet. Despite Yoona's attempts to keep these two women at bay, they keep coming back for more.

Follow Yoona, the daughter of Lucifer, as she travels to the mortal world to complete a task assigned to her father by Eros the cupid. Her mission is to make Global K-Pop Superstar Jennie Ruby Jane Kim fall in love with someone.   But when her father is called away on important business, Yoona must