An extraordinary road to emotional healing opens up for an antisocial children's book writer and a selfless psych ward caretaker when they cross paths.

Once blessed with unique superpowers, a family loses their abilities due to modern day problems — until a mysterious woman changes everything.

In the year 1971, former Korean Air Force fighter pilot Tae-In (Ha Jung-Woo) works as a pilot for a commercial airline. He faces a crisis inside a hijacked flight with the passengers, including Yong-Dae (Yeo Jin-Goo), and his crew members, including Captain Kyu-Sik (Sung Dong-Il) and Flight Attendant Ok-Soon (Chae Soo-Bin).

Do-gyeong jumped in to save his student Ji-yong from drowning. After the two pass away, Myeongji, Do-gyeong's wife, and Ji-eun, Ji-yong's sister, are left alone in the world, having to cope with the loss of their loved ones. Myeongji travels to Warsaw, Poland, to avoid her harsh reality. She meets an old friend and hides her husband's death as if trying to reject the tragedy.

Desperation drives two nuns to perform an exorcism no nun should attempt. With a possessed child at the mercy of evil and the opposition of the Catholic Church, they take on the dangerous forbidden rituals themselves, putting their immortal souls in grave danger. They must confront the terrifying cost of their sacrilegious actions, but one goal remains: the boy must be saved at all costs.