Parasite

'''(※ This book contains depictions of abuse, violence, gaslighting, trauma, and other potentially triggering content.) Men are not given names by anyone. Without a name, he was simply called 'Parasite.' "That parasite is the reason... our Jeong-o is sick. If it weren't for that bastard, our Jeong-o would have been born healthy. Our poor Jeong-o... *sob*!" "Just as you'd expect from a parasite that sucked its twin's blood to be born. A bug-like bastard." The man was born first of the twins, but he was discarded. Because he was born a Beta. Because such a man was of no use. In the end, the man had to prove his worth by acting as a substitute for his twin brother. He had to have his useful...