Yes exactly what the person above said. It can technically be anything. Even a dot. It's just a placeholder in the comments section so that when someone finds the manga and they reply to the OP, you will also get notified because you also responded to this comment (by using ff). It's best to use something they will understand as your placeholder (like ff) because if you just put a bunch of random words or whatever the OP might think you are spamming them.
THIS IS IT. sorry for seeing this 2 years late but !!!! thank you so so much
i can't remember the name, but there's another manga (still ongoing) where the uke's lover abandoned him for five years and he ended up marrying a female friend and having a child, but then his wife passed away. does anyone know the title??