Forgotten Title Face slapping Bl novel

The shou was transmigrated I think to a novel where he was fat so he lost weight and the ml was his uncle I think. I remember that there was a woman that liked his uncle and she ended up in jail because she slapped him or something and she had the plans to an atomic bomb

 

Maybe the first arc of There Will Always Be Protagonists With Delusions of Starting a Harem ^^

 

It’s not but thank you I’ll read this while trying to find it