What do you mean? All three of them are real brothers? Illodel is their real brother?
Yeah, in the novel three of them are biological brothers. Lots of grapes, then at some point MC goes to the black market to buy poisonous grass for himself in case he gets pregnant, and one that causes infertility to feed Tiben, he eats it with delight without realizing. At some point MC finds their ex-teacher being beaten by Tiben at the street and this guy says having carried Tiben's child but is forced to kill it. So MC takes the teacher to a hotel to hide him while having Tiben capture and put to jail. MC later lands a job at Logan's office and his duty is to sort out his brother's letters, which most are love letters. Few days pass MC has sex with Logan at the hotel, the same one that MC has hid their teacher, Logan's told to leave once he's done, at that moment Tiben arrives at the hotel to kill the teacher, but he sees Logan at the lobby and goes straight to the receptionist to ask for his room key. Then he goes there, attempting to beat whoever omega his brother's slept with, only to find MC's sleeping inside and spends his rut with him out of anger. After that, to escape his brothers MC volunteers to marry the princess and moves to the castle but Logan ruins it by telling the princess to reject him. Their father knows his sons incestuous acts from the start but does nothing because he thinks MC's a beta and cannot produce an heir for him, until Logan admits having implanted a womb inside MC. The only one who truly cares about MC is MC's mother, aka his wife, and the father loves her a lot and he fears if she knows about this, she will leave him so he decides to hide everything from her. Then later MC uses the teacher's heat to trap the brothers but his plan failed and he gets punished for 3 days straight by both of them and ends up getting pregnant. The next day, MC eats the poisonous grass that he bought from the black market to have miscarriage and almost dies. The last chapter I read was their mother found out and went on a rampage, demanding a divorce.
Holy shit the mother is the only sane motherfucker in this whole story
If anyone is trying to read this expecting some taboo but wholesome smut. DON'T. it's just rape. And I heard apparently there's a novel and the brothers are actually biological in that one.