If you've been intrigued by the hack that took down Sony Pictures' computers, you've probably wondered who the self-proclaimed culprits, the "Guardians of Peace," might be. Are they disgruntled employees? Social activists? According to Recode sources, Sony is worried that they're actually North Korean cyberwarriors. The company and its security consultants are "actively exploring" theories that an outfit in China breached the network on North Korea's behalf. Investigators haven't confirmed anything, but they also haven't ruled out the Korean link so far.