My Wife's Brother Complex
And the imposter who had been masquerading as Finn was not only his twin but someone born into tragedy.
The imposter had been abandoned by his family as a baby, considered a bad omen because he was born just a few moments after the real Finn. He had been immediately discarded to the neighboring village's keeper, and for years, he endured nothing but cruelty. He had never even finished elementary school.
By the time he was old enough, he had been forced into work, where he was abused. Eventually, after an altercation led to the death of another, he fled, planning to assume the identity of his brother.