The family lived in a rented, basement apartment -- usually the cheapest unit in a multi-apartment building, the newspaper reported quoting building owner Lim Bong-ae, 67. Police identified the shooter's father as Cho Seong-tae, 61.
"I didn't know what (Cho's father) did for a living. But they lived a poor life," Lim told the newspaper. "While emigrating, (Cho's father) said they were going to America because it is difficult to live here and that it's better to live in a place where he is unknown."
The small apartment where the family lived is now vacant and its front door was left unlocked Wednesday. Mildew stains mark the pale blue walls of the three-room residence, which is no larger than 430 square feet.
At the Shinchang Elementary School that Cho attended for first grade and half of second grade, there were no records of the former student besides that he left school Aug. 19, 1992, officials said. Cho's former homeroom teacher was no longer working at the school and other teachers did not remember Cho.
Meanwhile, South Korean President Roh Moo-hyun held a special meeting with aides Wednesday to discuss the shooting, as the public expressed shame over a South Korean citizen being identified as the gunman.
"I and our people cannot contain our feelings of huge shock and grief," said Roh during a news conference. "I pray for the souls of those killed and offer words of comfort from my heart for those injured, the bereaved families and the U.S. people."