I think Doha and Doyul were actual twins and one died, so the other out of guilt created a second personality recreating the dead twin. I also think Doyul is the predominant personality based on the father putting down Doha's picture on ch18 and that's why Doha is so protective, he was created for that, to protect Doyul from trauma.
I think Doha and Doyul were actual twins and one died, so the other out of guilt created a second personality recreating the dead twin. I also think Doyul is the predominant personality based on the father putting down Doha's picture on ch18 and that's why Doha is so protective, he was created for that, to protect Doyul from trauma.