What are the characteristics of the shoes worn by the perpetrator?(犯人が履いていた靴の特徴は？)

Based on the footprints of the perpetrator left on the scene, we now know that his shoes are a Korean brand named Slazenger.
Furthermore, the investigation conducted on the footprints revealed that they had not come from brand new shoes.
In other words, the perpetrator did not get a new pair of shoes just before the murder. He was wearing his comfortable shoes.

Slazenger (manufactured in South Korea)

Two types: tennis shoes and basketball shoes

Tennis shoes: gray line with white base, blue line with white base
Basketball shoes: gray line with white base, blue line with white base, white line with blue base

27.5 centimeter (Japan)

South Korea

Between October 1998 and November 2000

• Brand name, “Slazenger”, marked on the upper outside and the sole
• Shoe holes: six holes on each side for tennis shoes and eight holes on each side for basketball shoes
• Shoes of the same size were not on sale in Japan through regular channels.
• We are not sure if this is a parallel import product.

We know that the shoes worn by the perpetrator were on sale in South Korea.
We are now looking for the information from the public, including:

• someone who has the shoes of the same size;
• someone whose acquaintance was wearing the same shoes;
• someone who bought the same shoes during his/her trip to South Korea before the murder or knows someone else who bought the same shoes in South Korea; and
• someone who sold the same shoes as a parallel import product before the murder or knows of such trader.

Taken between 1998 and 2000, during which the shoes were on sale.
Someone you know may have been wearing the same Slazenger shoes.We are looking for courageous information from you.