1: Everyone gets shocked at Mr. Yoo's sudden death, especially Kim Ji Hye, who had given him sleeping pills the night before. She recalls the events leading to his death and the suspicious letter she found addressed to her, a letter that could possibly exclude her from his will. 2: The police start their investigation and conclude that there are signs Mr. Yoo's death could be a murder. After reviewing the security cameras, they also learn that no one else entered the house the night of his death, leaving only the inhabitants as suspects. Later, the detectives discover Mr. Yoo's safe and an important clue. (Source: Viu)