Disguise skill has several uses, including sneaking around using someone else's appearance. This illusion skill also can hide someone's identity. The fact that it can change appearance means that nobody will suspect that the person is you if it was perfectly comprehended.
Lu Shang decided to start learning the disguise martial arts technique first. Then, once he mastered the technique a little, he would study the defensive martial arts technique. This way, he wouldn't risk being discovered since he's just starting.
Lu Shang was opportune to see this disguise technique in the library but it was dusty and like it had been abandoned for ages. Seems like nobody wants to comprehend this technique for a certain reason even when it was classified as a core-tier martial art technique.
He started to flip through the martial arts technique.
