Tell me metropolitan city of South Korea whose name has the word ulsan in it.
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q482821 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'ulsan')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
metropolitan city of south korea: Q482821