Boys Republic's Minsu revealed on the April 7 airing of 'Cultwo' that he suffered quite a substantial injury to his head. 

The idol explained, "I struck my head on the ceiling of the practice room." 

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Minsu said, "The ceiling has always been low. I had to get around eight stiches. I'm basically hammering metal (wire sutures) onto my head." The other members added, "The [stitches] are held in place by staples." 

That sounds very unpleasant....let's wish for a speedy and painless recovery for Minsu!