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During his talk with the reporters, Joo Won received a question which asked him to divulge the difference between the females co-stars he has worked with, namely Moon Chae Won and Kim Tae Hee. On Moon Chae Won, whom he starred with in 'Good Doctor,' Joo Won said, "Chae Won noona is very autodidactic. Her script pages were filled with memo notes," revealing that the actress is very independent and likes to self-teach.

Unlike Moon Chae Won, who apparently likes to figure out the script on her own, Kim Tae Hee is the opposite, at least according to Joo Won. He said, "Tae Hee noona is the type to listen to the director and producers a lot. Before filming, she converses with the producers and on set she talks with the director a lot."