After Y/n loses her memories in a mysterious accident, she wakes up next to a powerful businessman who claims to be her husband. Although the man's face is familiar to her, dark secrets slowly begin to emerge behind their seemingly perfect marriage. When her husband's dangerous and manipulative younger brother appears, Y/n soon finds herself in the middle of a family power struggle that involves lies, surveillance, and a hidden past. As her lost memories gradually return, she realizes that her accident was no accident...and that someone would do anything to prevent her from remembering what she saw that night.