The 'secret appraisal technique' was a rather troublesome skill, and Song Shuhang had to pay a heavy price every time he wanted to use it. In addition, once in a while, it would even activate on its own...
However, he had ultimately managed to grasp the secret appraisal technique a little, and along with his comprehension of the technique getting better and better, there was bound to be a day when he would completely master it.
As such, Song Shuhang was willing to keep this 'secret appraisal technique' with him even if it was somewhat troublesome.
