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The accident occurred during the early hours of September 3, and it has been determined by the prosecution that Mr. Park had sped at 135.7kmh (~85mph) before slipping on the wet road and colliding into a barrier.

The speed limit of the highway is 100kmh (~62mph), but because it was raining that day, the car should have been going 80kmh (~50mph), 20% less than the speed limit, according to traffic laws.

Mr. Park said during the prosecution's investigation, "Because the speed seemed too fast, I had stepped on the brake, but the car slipped."

The prosecution revealed, "Mr. Park had said during the early police investigation that the cars' back wheel had fallen off right before the accident. However, we have confirmed that the wheel fell off after the accident occurred." To address the questions about whether the airbag not being deployed contributed to the fatality, the prosecution added, "The air bag was not deployed in the front seat, but this was because it was the side of the car that collided with the barrier, so we have determined that there was no fault with the cars' airbag mechanism."