Other mistake: The character Su-mi is depicted as an adolescent girl in her teens. She is introduced in Episode 2, which is set in 1902. Episodes 2 through 22 take place between 1902 and 1904, then a 3-year time jump occurs, meaning Episodes 22 through 24 take place in 1907. Also, the final time we see her, she is shown as a member of the Righteous Army which takes place two years after 1907 (1909). Yet during this 7-year timespan, she shows no signs of ageing.
Mr. Sunshine (2018)
1 mistake in Season 1 generally - chronological order
Starring: Kim Tae-ri, Lee Byung-Hun, Yo-Han Byun, Yoo Yeon-Seok
Trivia: Daily Mail journalist Frederick McKenzie takes a photo of the Righteous Army, which is stated to be the only existing photo of Korea's freedom fighters. This photo is a direct recreation of a real-life photo of the Righteous Army, taken by Frederick McKenzie (who was a real-life war journalist) and is to date, the only existing photo of Korea's freedom fighters. (00:30:12)