[Spoiler] "Road to the Airport" Shin Sung-rok and Choi Yeo-jin, lovers in the past?

"Road to the Airport" Shin Sung-rok and Choi Yeo-jin seem suspicious.

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It seems that Park Jin-seok (Shin Sung-rok) and Song Mi-jin (Choi Yeo-jin) have a past.

Park Jin-seok arrived in Sydney and called Choi Soo-ah (Kim Ha-neul). Then he also called Song Mi-jin.

She didn't answer the phone because she was talking to Han Ji-eun (Choi Song-hyun) who suddenly said, "You told me you met your ex-boyfriend at a pub in Sydney. You said one third of him was with you, one third was in another country and another one third was married to your friend".

Song Mi-jin was surprised and said no when Han Ji-eun asked if he was a flight attendant.