Under the hegemony of the interstellar powers, the Federation monopolizes technology and forcibly labels Blue Star an "inferior race." Its survivors are scattered and exiled, struggling to survive in desperate circumstances. Lin Shen, a transmigrator from Earth, unexpectedly takes over the body of a lowly repair apprentice on Ironwaste Star and awakens a mysterious repair skill bound to his soul. To protect this secret, which could get him killed, he pretends to be timid and dull, using a "worn-out repair manual" as a cover story. He cautiously builds his strength under the shopkeeper Wang Scar's bullying and probing, all the while searching for a chance to survive.
By chance, he attracts the attention of Su Wan, a mysterious woman in a cloak. Cool-headed and perceptive, her identity is shrouded in mystery. She is investigating a secret conspiracy involving discarded Federation parts, and she quietly sees through Lin Shen's act of hiding his true abilities. From testing one another to working together in perfect understanding, they join forces amid the ruins of Ironwaste Star to overcome one crisis after another. As they evade Wang Scar's harassment and schemes and flee the Federation's pursuit, they gradually uncover fragments of the truth behind Blue Star's exile.
To escape the desperate situation on Ironwaste Star, Lin Shen uses the parts he has gathered to refit a starship and leads his trusted companions into the vast reaches of space. Together with Su Wan, he searches for the scattered survivors of Blue Star and forms a resistance squad of their own. They join forces with alien species oppressed by the Federation, relying on Lin Shen's mysterious skill and Su Wan's guidance to clash with Federation hunting teams time and again. They fight to shatter the Federation's secret conspiracy and seize the vital resources on which survival and hope depend.
