Kang Seo-jin (Kim Mu-yeol) is an architect who is still mourning the loss of his wife in a hit and run accident. Balancing work and caring for his daughter Ye-na, Seo-jin’s world is further disrupted when he receives a call from an orphanage claiming to have found his long-lost sister, Kang Yoo-jin (Song Ji-hyo). As the family reunites, suspicions arise about Yoo-jin’s true identity and motives.
Yoo-jin gradually wins over Seo-jin’s family, causing Seo-jin to question her intentions. As he delves deeper into his wife’s accident investigation, Seo-jin discovers unsettling connections to Yoo-jin. With the aid of a psychiatrist friend, Seo-jin uncovers a shocking truth about Yoo-jin’s past and her involvement in a religious cult.
As Seo-jin unravels the dark secrets surrounding Yoo-jin and the cult, a deadly confrontation ensues. With the safety of his daughter at stake, Seo-jin must confront his past and make a fateful decision that will change everything. The film culminates in a gripping finale that will leave viewers on the edge of their seats.
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