"After a brief stint on Cloud9's Challenger lineup this summer, jungler Lee "Rush" Yoon-jae has returned to his home country of South Korea after no longer wanting to compete in the Challenger Series, sources close to the organization and player tell ESPN.
In his place, the team has signed former Ember jungler Juan "Contractz" Arturo Garcia, who will compete with the team in its upcoming games versus fellow Challenger Eanix tomorrow night. Contractz was originally added to the lineup on June 10 after being negotiated out of his contract with Team Nova, who purchased both Ember's spot and his contract.
The specific reasons for Rush's departure are uncertain, but sources say they stem from Riot Games enacting a new residency rule that requires imports to live in another region for four years before being eligible to declare residency."
Fuente: http://espn.go.com/esports/story/_/id/16208434/rush-returns-south-korea