A spin-off of the Japanese anime "free!", CP Linyao. The setting is a social person, Haruka-chan's work setting is an editor [because I think this is easy to write] Rin-chan selfishly lets him continue swimming [enough] If you can accept it, please continue...
There is probably a section about torture or something. Anyway, you can rest assured that Linlin's article is definitely HE.
Regarding the question if you want to know the letters
The number of times varies depending on the plot, but it won't be many because it's a long story... Probably more than once.