Maybe is about an 'ordinary' teenager who gets sucked into a new world and war, while learning about his forgotten past. A really good read that'll leave you on the edge of your seat.
It is completed, but I am not sure if it has a sequel/spinoff. I would only rank it as mature for the daunting tasks he goes through rather than a sexual rating.
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Turn Off the Camera by Kang Unnie/ MissPM
An unknown idol gets the chance of a lifetime to participate in a variety show-esque series about three celebrities trapped in a house together with no phones or internet.
On the first day the shy protagonist finds out that the other two are having a friends with benefit deal, and are trying their best to get him in their beds.