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Black Prison, as the Daisi Family's place of imprisonment, is not somewhere just anyone can be locked up. If it's only a minor error, the Daisi Family has plenty of other ways to punish—it's not necessary to be sent to Black Prison. Those who are usually locked up in Black Prison are those who have severely violated the family rules, like Hake who had stealthily fled the family's control and extensively cleansed his Killing Intent. Over dozens of Eras, the number of people from the entire Daisi Family who have been confined in Black Prison is not large, merely a few hundred.
No. 581 Cage, a desolate planet, is also where the Daisi Family detained Hake.
