Lin Chen, who returns through rebirth, memorized a large amount of top-secret mecha knowledge in his past life to disguise himself as a scion of an aristocratic family, only to unfortunately die in battle. Returning to the age of eighteen, he inherits his legacy and wants nothing more than to bury himself in building his own mecha to steadily cope with the future interstellar war crisis. Yet the hardcore mecha knowledge he memorized so well in his past life belongs to top-secret classification in the present. Casually modifying blueprints and tossing out component codes, he continuously brings huge shocks to equipment bureau experts and academy teachers and students. Everyone layers their own brain supplements, treating the low-profile and pragmatic Lin Chen as a hidden grandmaster. On one side, people crazily supplement and pursue him; on the other, the male lead focuses entirely on R&D, staging a series of joyous mismatched stories.