According to OSEN, the actress will make a cameo appearance in the drama on August 25. Her management company, Big Boss Entertainment, verified the reports as accurate. They requested that viewers watch the telecast for further information.

Lee Il Hwa makes a special appearance thanks to her work on the dramas Reply 1997 and Reply 1994 with Hospital Playlist writer Lee Woo Jung and director Shin Won Ho. Lee Il Hwa played the protagonist's mother in both projects. Sung Dong Il, who played her husband on both occasions, has previously made a cameo in the drama as Ahn Jung Won's (Yoo Yeon Seok's) big brother and priest Peter.

Lee Il Hwa was previously thought to play Jang Gyeo Ul's (Shin Hyun Been) mother, whose voice was heard briefly in episode five when they were conversing on the phone. Nothing, however, has been confirmed.

Shin Wonho's dramas have a pattern of including cameos from his prior works, demonstrating how the characters appear to have a link to his previous dramas. Jung Kyungho, for example, had a major role in his previous drama Prison Playlist, and Yoo Yeonseok played Chilbong in Reply 1994. Finally, with Sung Dong-il, Kim Sungkyun, who played Ra Miran's husband in Reply 1988, appeared as Ahn Jungwon's other older brother.