This is a extremely sweet and wholesome manhwa. It's also one of the very few manhwas that includes a proper preparation for anal sex and a seme that checks on uke's well-being and pleasure before, during and after sex (first couple).
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The first couple is absolutely amazing, with one of the greenest semes I've ever seen. The second couple is also cute and adorable, but there were a few things that bothered me a little (their first time and uke being a bit violent once). Their stories are told interspersed, since they all know each other (they're friends) and their relationship develop almost in parallel.
A Barbershop Quartet