In chapter 53 the guy with short blond hair with glasses (i forgot his name) said that Luan is still worried about the difference in Yul and his body size.So maybe Yul's body is really suppose to be small thus the illustrations of Yul looks like a child.
In chapter 53 the guy with short blond hair with glasses (i forgot his name) said that Luan is still worried about the difference in Yul and his body size.So maybe Yul's body is really suppose to be small thus the illustrations of Yul looks like a child.
......or more like teenager.
I thought it could be a sign of malnutrition in his childhood
That's what I think is the reason too