Part 1: The secret behind Im Hee Jung’s death is revealed. Jang Ki Ho finally understands the message that was left in the book, but as Yoo Pan Sool is found dead, he’s brought to the police station as a key witness. Part 2: Young Jin and her team arrest Oh Du Seok as the prime suspect of the murder of Yoo Pan Soo. Jang Ki Ho decides to lure Baek Sang Ho to the church where he has a one-on-one talk about the secret the book is holding. (Source: Viu)