Rebirth of the Useless Son-in-law in 2080

In 2050, humanity is divided into classes by genetic rating. Gu Fan, rated D, lives in a 6-square-meter container on the 300th floor of a vertical slum, with a credit score just enough for one daily synthetic protein meal. He thought this was his life. Until one day, a sensational engagement cancellation is broadcast citywide—Su Qinghan, heir to the Sky Dome Biotech and an S-grade goddess, is publicly humiliated by her fiancé. To save face, the Su family announces they will recruit a son-in-law from the lower classes. Gu Fan is chosen. The whole city mocks this useless son-in-law. Su's second uncle forces him to sign an agreement renouncing his rights to his name and to have children. His new wife draws a forbidden zone, not even allowing him upstairs. But hidden in Gu Fan's mind are three encrypted memory chips. When the first chip accidentally unlocks, he begins to see things he shouldn't—the murderous intent, lies, and greed in others become as clear to him as bullet comments. His blood reverse-engineers detection equipment. His past is labeled 'Sample X'. He is the sole survivor of the global memory black market heist that swept the world ten years ago. And the cold wife who secretly sends him a custom chocolate every night is being pushed into the abyss by her family. 'I'm just a useless son-in-law,' he says. 'No,' she says, her fingers tracing the old scar on his wrist, 'you are the one they fear most.' — Description from novelcodex.org