Choi Yoon-ha, a lawyer known for her invincible legend, loses everything in a mysterious fire. To secure the treatment costs for her only surviving sibling, she begins a dangerous deal with Sung Ji-hoon. "I need a woman who won't stand out." "Is that my mission?" Yoon-ha finds herself increasingly drawn into a world of saints and sinners who desire her. Can she uncover the truth behind the fire that took everything from her?