Nobody Knows Season 1 Episode 4 (2020)

Sun Woo hears from Dong Myung that he used to work part-time at Millennium Hotel with Eun Ho upon request from Chang Su, Su Yeon’s boyfriend. Meanwhile, with Su Yeon’s permission, Young Jin goes into Eun Ho’s house to look for a bag Eun Ho used to carry. She catches Chang Su who tries to sneak into the empty house and hears from him about what Eun Ho had found at Millennium Hotel.