Cinderella at 2 AM S01E05 - The Anonymous Texter

Ju-won leaves his family and shows up at Yun-seo's door. His appearance exposes their relationship to the team, who even discover that their breakup was because of Ju-won's family's opposition, causing them to create an unbearable atmosphere for her in the office. Meanwhile, a crisis hits the Hanok Stay grand opening art exhibition, but Yun-seo is away from her desk to handle it.