Danielle George - All Headline News Staff Reporter

The 28-year-old man, identified only by his family name Lee, had been playing on-line battle simulation games at the cybercafe in the southeastern city of Taegu.

Lee started the gaming session on Aug. 3 and only left his computer screen over the next three days to go to the toilet and take brief naps on a makeshift bed.

A police spokeman says, "We presume the cause of death was heart failure stemming from exhaustion."

Lee recently quit his job to spend more time playing games, the daily JoongAng Ilbo reported after interviewing former coworkers and staff at the Internet cafe.