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![Park Hyun, a visiting professor at Pusan National University’s School of Mechanical Engineering, shares a photo taken in March of his Covid-19 recovery process in May on Facebook. Despite being cleared of the virus, he says he is suffering aftereffects to this day. [FACEBOOK]](https://image.koreajoongangdaily.com/10199637.jpg?imageId=10199637&width=240&height=184&format=webp&format=jpg)