Chen Mo works as a cleaner at ASML in the Netherlands and is looked down on by his colleague Bas. When a lithography machine malfunctions, Chen uses his physics expertise to identify an algorithm error, astonishing Professor Van der Wal. Faced with accusations of academic plagiarism, Chen exposes Hansen's scheme to forge a request to remove his name at a hearing, clearing his name and restoring his authorship. In the end, he turns down a lucrative job offer and chooses to continue working as a cleaner, staying true to his original dedication to science.