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The character 煩 (fán) evolved from ancient pictographs depicting a person with fire or heat affecting their head, symbolizing 'worry' or 'annoyance.' In Liushutong (六书通) classification, it belongs to the phonetic-semantic compound category (形声), combining the 'fire' radical (火/灬) with the 'head' component (頁), creating the meaning of mental agitation that feels like one's head is burning. Originally meaning 'hot' or 'feverish,' it extended to represent mental distress, trouble, and bothersome matters. Over time, the character simplified while retaining its core concept of something that 'burns' the mind. Arrived in Japan: The character 煩 arrived in Japan during the 5th-6th centuries CE, primarily through the introduction of Chinese writing systems and Buddhist texts. It was adopted into Japanese as 煩 (bon/wan) in compounds and 煩い (urusai) meaning 'annoying' or 'troublesome,' appearing in early Japanese literature like the Manyoshu (8th century) and becoming integrated into both the Japanese writing system and vocabulary during the Nara and Heian periods.