How is Han alive in fast and furious?

In the Fast & Furious franchise, Han Lue was initially believed to have died in a car explosion at the end of Fast & Furious: Tokyo Drift. However, it was later revealed that he had survived the accident and was living in Tokyo.

In Fast & Furious 6, it is explained that Han was saved by Mr. Nobody and recruited to join his team of elite operatives, which also included Letty Ortiz, who was also presumed to be dead. Han and Letty eventually reunite with Dominic Toretto and his crew in the subsequent films.