Overview: Cheol-su goes missing on the eve of his birthday, while the sisters learn of the secrets that are recorded in his diary.
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First Air Date: Mar 13, 2021Last Air date: Sep 18, 2021Season: 1 SeasonEpisode: 50 EpisodeRuntime: 70 minutesQuality: HDIMDb: 6.00 / 10 by 5 usersPopularity: 40.69Language: Korean