"It's great," Rubin said. "I never thought this day would come."
Her ordeal began on Aug. 21, after her ex-boyfriend Jeffrey Salko disappeared with their child after a visit.
At the time, he had joint custody of their son but was facing up to six months in jail for not paying child support. The boy lived with his mother and saw his father on alternate weekends.
Kobe's court-appointed law guardian, Joseph Fredericks, had recommended Rubin receive sole custody.
"They were constantly at war over this child," Fredericks said of the parents, who separated when Kobe was 4 months old.
After Salko disappeared with her child, Rubin was afraid her ex, born in South Korea, had taken the boy abroad.
"I was just basically panicking," said Rubin, 30. "I was hoping they were still in the United States."
Her fears were realized when she hacked into Salko's e-mail account, she said. She discovered an e-mail he had sent to a friend saying he was flying to South Korea - and wasn't coming back.
Mark Miller, founder of the American Association for Lost Children Inc., a Christian charity that recovers missing children, persuaded her to put him on the case.
"She was so distraught," Miller said. "Her whole world was taken from her."
The FBI issued a warrant for Salko's arrest, but Rubin didn't get her big break until January.
She received a message on her MySpace page from someone who had seen her son and knew where he went to school. Shortly after, she received a phone call from Kobe telling her he missed her - and Salko was listening in. Rubin said her son wasn't aware he had been kidnapped.
Shortly after, she flew to South Korea with Miller and Bazzel Baz, chief executive officer of the nonprofit Association for the Recovery of Children, to recover Kobe.
The men surveyed the school while Rubin waited in a hotel. Security appeared to be lax, Rubin said, and the next day she went to her son's classroom and called his name.
"I was like, oh my God," Kobe said. "I can't believe she's here."
Rubin explained who she was to her son's teacher and said she needed a minute to speak with him. Then mother and son walked out of the building and hailed a cab to the American embassy.
As a precaution, she made Kobe wear a wig, so anyone looking for them would think he was a girl.
The following day, mother and son returned home.
"He's doing good, watching cartoons and wanting to play video games," Rubin said. But "he's a little worried that his dad's going to take him again."
FBI spokesman Matthew Bertron said the bureau was trying to work with South Korea to secure Salko's arrest and extradition. Calls to his family Thursday went unanswered.
Almost 800,000 children are reported missing each year, according to the U.S. Department of Justice. About one-quarter of them are abducted by family members.
