Even if there is a hundred steelmaking, it will turn into a soft finger.

in ancient times, it refers to the ability of forging technology. The softening technology of steel has reached the point of perfection. Iron is very brittle. After forging with the tempering technology, it can be softened and wound on the fingers.

Later, it was also used to describe the feelings between men and women, especially when the hero was stuck by a beautiful woman.