Hakubo Sada was Japanese samurai and a retainer of the Kurume Clan (Fukuoka Prefecture).
Hakubo Sada was born in 1835, Japan.
He went to Edo (1852) and studied at the Shoheiko, the Shogunate college.
Sada Hakubo visited Uraga (1853), he went there to observe the situation. He led a band of troops to Edo (1862) in an attempt to overthrow the Shogunate. For the action he was imprisoned by his clan.
After the Meiji Restoration (1868), he advocated an expedition to Korea, indignant over the country's refusal to maintain diplomatic relations with Japan. He went to Pusan as a government envoy (1869).
He resigned because the government failed to decide to invade Korea. He then wrote articles advocating a strong policy toward Korea.