Korean is the primary language; English and other foreign-language support details are not documented.

• Korean language support confirmed at the location
• English, Japanese, and Chinese language availability not documented
• No information on multilingual signage along Daehak-ro
• No audio guides, sign language guides, or alternative language accessibility services documented
• Individual venues on the street may offer their own language support independently

Based on language_support field showing korean=true; all other language fields (english, japanese, chinese_simplified, chinese_traditional) are null. Accessibility fields (audio_guide, sign_language_guide) are also null. The answer reflects only documented data and notes the absence of information on typical foreign-language amenities.