The Twin Sister [TCF Story]

Cale Henituse's was a trashy young master.
He was trash and everyone knows it.
He was beaten to a pulp because of it.
Everyone knows that he has a father, a dead mother, a stepmother, a stepbrother, and a half-sister.
That was written in the Birth of the Hero.
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But why does he have a twin sister here?!

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The story TCF is not mine, it belongs to Yoo Ryeo Han-nim. I just did my OC. The cover was edited by me, but the female red-haired portrayed there is Leticia from the manwha "My husband hides his beauty" also not mine,