A mystery thriller about a mother who is losing her memory and her son who is gaining his lost memories back.

Doh Ji-wook is the author of Power of the Truth that gives hope to others, and his mother Joo Kyung-hee, a hairdresser at Kingdom Hair Salon, gives good care to her neighbors. One day, their peaceful kingdom is infiltrated by Kyung-hee's dementia. Doh Joong-myung, a pastor, wants to uncover the truth. In turn, they make different choices to protect their family.