너무 늦지 마세요.

This is a phrasal expression combining several elements: * **너무 (neomu):** An adverb meaning 'too,' 'excessively,' or 'very.' Its origin can be traced to Old Korean, and it has consistently denoted intensity or extremity. * **늦다 (neutda):** The verb meaning 'to be late,' 'to delay.' This verb has a long history in the Korean language, appearing in various forms throughout its development. It's related to concepts of slowness or exceeding a designated time. * **-지 마세요 (-ji maseyo):** A polite negative imperative suffix. It's composed of: * **-지 (-ji):** A connective ending used to negate a verb or adjective. * **말다 (malda):** The verb meaning 'to stop,' 'to cease,' or 'not to do.' This verb is fundamental to forming negative commands or intentions in Korean. * **-으세요 (-euseyo):** A polite honorific ending used to form commands or requests. Combined, '너무 늦지 마세요.' is a modern Korean construction that clearly and politely conveys a warning or request not to be excessively late. The elements themselves have deep roots in the Korean linguistic tradition, with '너무' and '늦다' having histories spanning hundreds of years in various forms, and the negative imperative '말다' being a core grammatical component.