“1363. Gaesung. Ji-sang (our young hero) grows up streetwise and clever.”
According to this drama’s time Ji Sang would have been 10-11 years (born 1352/53) old but you have then18 years old David Lee (born 1964) paying a kid. Weird!
Same for Jung-geun and Hae-In; the actor/actress who played both characters was Noh Young-hak and Son Na-eun, then 19 and 18 (born 1993 and 1994 )! They and Ji Sang were supposed to be 10-11 year old kids but they looked very much older.