"is this good?" : Personally, I like this and its rating is 9.3 so I guess, yes?
" i read from the comments that there's rape involve here, okay" : Yes but it only occurred once around Chapter 2 I think. Read Chapter 54 since this part shows us that it was kinda not exactly rape but is kinda technically is since the uke is intoxicated so was kind of not in the right mind to make decisions. Just look at it yourself and decide.
"but is the rapist the main character here as well??" : Yes, he's that guy black haired guy you see in the cover. But honestly, the word "rapist" here is just so carelessly/mindlessly thrown around.
Since the opinion about the rape here is pretty divided, you should, again, read it yourself and decide.
Artstyle: Personally, it's not the best but it eventually grew on me and became one of this manhwa's "charm.
Story: Pretty "slice of life" but involving male impregnation.
Overall: Aside from the "rape" part, personally, this manhwa is pretty nice, shows the domestic life of a couple. You might find the Seme too manipulative/controlling/stalkery but honestly, some people are just too harsh on him but since each person is different, you might find him unlikeable too so you do you boo.

is this good? i read from the comments that there's rape involve here, okay.. but is the rapist the main character here as well??