Power level of a martial artist's ability, so far in this story (Manhwa/Novel) no type of power scale has been created either by title or quantity.
10 years of Energy
Master->Master Pico-> Grandmaster.
Rank Gold->Ruby->Jade->Jade Gold
But there are some interesting comparisons that can be made.
in the fights shown
Yong Seol Lan vs Im Sayeol = Strength 10 vs Strength 3 couldn't even be called a fight
Pyo Mol Vs Wu Gunsang = Strength 10 vs Strength 8 It took work and hurt the MC, but his skill was easily predicted even though he has the full martial art.
Pyo Mol Vs So Taemyung + Jo Pyeonggwnag = Strength 8 vs Strength 5 Jo Pyeonggwang managed to survive being in a 2 on 1 fight and Pyo Mol is injured and is on the run, Pyo Mol managed to kill a master at high speed and a master who lived over 60 years old.