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Ethingan created a topic of Legs That Won't Walk

I've been wondering this for a while, but about Sooyoung's leg injury. Is it permanent? Or will it heal? I mean, he's been having that crutch for the entire series so far. If it was gonna heal naturally it feels like it would have become better by now. But it's so sad if he'll never be able to walk again ╥﹏╥