He was wearing a back brace on February 12 at his fan meeting. Fans found out after requesting to see his abs, when he responded, "I have back pains because I over-exercised, so I have a back brace on." He also could not bend down properly.
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On the injury concern, his agency told TV Report, "He has back pains. However, he's getting better."
Hopefully, he hasn't hurt his back too severely and gets better soon!