More details from the murder of a ROK Marine on Ganghwa Island that was captured over a week ago, have now been released:

The man who killed a marine and stole weapons plotted the crime in detail, having surveyed of the crime scene two weeks in advance, according to the military police.

The suspect Cho Yeong-guk, 35, was handed over to the military prosecution.

Cho was arrested last week for killing a marine, injuring another in Ganghwa, Gyeonggi Province, on Dec. 6, and stealing a rifle, ammunition and a hand grenade from them. The metal work major fled to his studio in Hwaseong, left the weapons there and burned the car he used in the crime in a nearby rice field.

He later abandoned the weapons under a bridge in South Jeolla Province, and left a letter describing their location in a postbox in Busan. Police identified him from fingerprints on the letter.

When caught, Cho said he committed the crime on impulse due to depression, but the military police said this was false. He later said that after he was dumped in September by a girl he had dated for 10 years, he decided to destroy himself by committing a serious crime as revenge to give her feelings of guilt. [Korea Times]

The rest of the article goes on to explain how he planned in detail the operation to steal the weapons.  I speculated he either did because he was a wacky leftist trying to cause trouble before the election or he went nuts because of girlfriend issues and it appears girlfriend issues is what caused it.