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Ritsu created a topic of Pearl Boy

How the hell did Jooha and Dooshik not have any diseases? Dooshik slept with someone in prison who slept with everyone which ended up being his gay awakening. And Jooha got r- worded by multiple people. I always wondered this when I was reading so I’m sorry if this seems like an odd question but it’s just strange to me how none of them had any diseases