This shop have provide the size, materials and waking method chart as below
Korea Fashion Measurement - Reference Chart
Korea Shoes Measurement
Generally speaking, Korean shoesare measured in mm. For example, the length from toe to heel is 230mm,plus thethickness of the materials, customers are recommended to select the size of 235mm or 240mm.
It can be slightly adjusted by wearing socks or shoe pad if the shoes are oversize.
The result may have minor differences due to the measurement is made by individuals, customers are responsible for size chosen on their own decision made