"Jeguk High School graduate Cha Eun Sang, visited the school's cafeteria," she posted on social media earlier. "I can't believe this is still here."

Park Shin Hye played one of the protagonist roles on 'Heirs', which also starred Lee Min Ho, Kim Woo Bin and other high-profile stars.

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SEE ALSO: The Outstanding K-Dramas of actress Park Shin Hye