Im not really sure about what I'll say since I read it somewhere, but it could be a spoiler so
SPOILER
SPOILER
SPOILER
SPOILER
Hajin is not her son , he is born from another woman out of wedlock , but because he resembles a "biological son" more , he was chosen by the father as the "official son and heir" , that's why there is a scene in the manhwa where her real son (the one with her in the scandel picture) says to hajin : "You stole everything from me" or something like that
SPOILER
No, Hajin is her biological son; he is actually the second son born because the first son was weak and unhealthy. The family literally switched their lives, with Hajin taking over his older brother's life and the brother being dumped in England. He is actually younger than everyone. The mom felt tormented and instead of hating the family she hated her son
lol now idk what to believe
i want to believe more that hajin is also a biological son at least it means he also has right to the luxury and doesnt "steal" too much. (he was never in fault to begin with)
but OG Hajin being actually younger than he is sounds interesting... it means on top of being raised in unhealthy environment the original hajin's mental age is also less developed than what people's thought... so the matter of the MC transmigrated as hajin add more purpose which is making "hajin" stand on the same "mental age" or even more with the other characters

aaah i am so curious
but it feel impossible that hajin is a fake son
after all that mom often said, "i gave you my face", "you are my son that's the problem"
so it just feel like a case of she love the other son more?? it's so mysterious i want to know already!
but the other son said hajin was a fake? ( ̄∇ ̄")