The reporter said, "Jun Ji Hyun, who plays the female lead named Cheon Song Yi, initially turned down the casting offer . . . Jun Ji Hyun was receiving a lot of love calls from movies and dramas since the blockbusters 'The Thieves' and 'The Berlin File' . . . When the offer for 'You Who Came From The Stars' came in, she was already planning to be in a movie."

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According to the reporter, the production team were persistent and did not give up despite the actress's scheduling conflict. Additionally, Kim Soo Hyun, who already worked with the actress in 'The Thieves' and believed she was the only one who could pull off the part, personally contacted and persuaded her to join the drama.

A fan of Kim Soo Hyun, Hong Suk Cheon said, "I can play Cheon Song Yi well, too."