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I really don't understand this family tree, we need to know more about Jitae's father.
Because if I understand right Jitae's Mom and Dad were married first. But then why is Jian the oldest son? Did his father cheat on Jitae's Mom with Suryeon, had Jian (Yeah I know he is actually from Mr. Park) , and then go back to Jitae's Mom and had Jitae?
And then divorced from his Mom? I don't know anymore