The 38-year-old man collapsed Thursday as he was playing an on-line game at an internet cafe in Incheon, west of Seoul.
"He was carried to a nearby hospital but declared dead on arrival," a police officer told AFP.

The officer said the man had played computer games from morning to night every day and had barely stopped to sleep.

In August, a 28-year-old man died in southeastern Taegu city after playing an online computer game for more than two days.