4. Building nice city surroundings as a result of voluntary activitiesmeant to preserve the environment in the surrounding habitat. 4 pillars??in English, referring on the four significant factors derived from these time markers: 12 months, month, day, and hour. Busan can also be the house from the Busan Biennale, as https://dominick75bj1.ampblogs.com/top-latest-five-busan-metropolitan-city-urban-news-69806581