You've said it yourself, he's been doing that from the very start, going on after his teacher.
That said... going from this
Early Shioon
Chapter 129
is pretty damn insane. Especially since in that one he's not ripping off the Nine Arts Dragon, but Kang-Sung De-Hyung (
this guy)
It's also amusing how Jung Lae Won(Chief) is the only guy who doesn't get it.
A nice bit is that a lot of the seemingly bad guys are mostly half decent people. Anti-villains, honorable...