As his understanding toward Tendon Changing Classic increased, Happy also discovered the similarities between this qi cultivation technique and Nine Yang Divine Skill.
Even though he lost the ability to copy martial arts, Tendon Changing Classic still allowed his qi to increase very quickly, just like Nine Yang Divine Skill.
Also, Tendon Changing Classic and Nine Yang Divine Skill were both amazing qi cultivation techniques. They would both automatically protect their user and reduce the damage he had to suffer.
One of it will automatically place a layer of Nine Yang Aura over his organs and body to fortify them.
One of them will add a layer of qi flow on his tendons and bones, and that qi flow was the periosteum that had yet to take shape.
Also, Tendon Changing Classic can just increase his defense without Happy needing to use any qi on it.
There was another thing that was rather similar about them.