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Janggo Hang is a company specializing in the production and distribution of various seafood products, particularly focused on high-quality fish and shellfish.

Janghoon High School is an educational institution in South Korea, providing quality education and various academic programs.

Janghowon Elementary School

Jangin Real Estate Agency specializes in the sale of rural houses, farmland, and land in Cheongyang.

Jangwon Korean Chinese specializes in providing online Chinese language education.

Jangro is a company specializing in cleaning and hygiene products.

This company offers reservation services for Jangsa-do tour boats, Haegumgang tour boats, entrance fees for Jangsa-do, boat schedules, and information on traveling to Jangsa-do, including discounted bookings for Jangsa-do tour boats.

The company manages Jangsado Marine Park and Camellia, offering beautiful island experiences.