@Apech
Thank you, and I fully understand what you mean. But actually, Seokmun is not my first meditation.
9 years ago, I tried one Taoism meditation to improve my poor health, only resulting in causing severe side-effects and making my condition even worse.
After that, I met one teacher, and he helped me a lot to cure the side-effect. He himself had the experince of suffering from severe side-effects, so he knows much about how to erase them. And he tought me how to distinguish process of purification and side-effects.
It seems that I am very susceptible to side-effects. My energy easily goes out of control.
So during practice, I have to pay much more attention to prevent them than others. The problem is only few teachers can deal with this sensitive problem of side-effects and purification.
I may be making mistakes framing the problem, but at the moment I am feeling lost, in finding a teacher.