448
Even so , a potential candidate is The Dark Overlord , a group of hackers who released the fifth season of Orange Is the New Black after Netflix refused to meet its ransom demands back in April 2017 .
 ( ransom: ransom demands,  Netflix: victim, April 2017: time, The Dark Overlord: attacker, a group of hackers: attacker) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( ransom: ransom demands,  Netflix: victim, April 2017: time, The Dark Overlord: attacker, a group of hackers: attacker) 