Cinderella's Oppa

One day, a half-sister suddenly appeared.
Because of her presence, the father became a daughter fool and the
the older brother became a siscon.

Having become a non-existent member of his family, he went to the
battlefield with honor, but in the end,
he met a bitter death.

But when he opened his eyes again,
he had returned to the past when he was thirteen.

However,

'I'm a eunuch... ''

Not as a man, but as a woman.