Jung-woo is stuck in a reincarnation cycle along with his nemesis, Shin-Ryong. Ever since he was little, he had a dream.
He wanted to become strong enough to conquer Murim.

However, things did not always go the way he planned. Shin-Ryong defeated him on every occasion.
At this point, Ha Jung-woo had been reincarnated 5 times and was defeated yet again.

When he was reincarnated for the sixth time, he is born into the modern world.
Being born into a new world changes Jung-woo's goal, as there is no Murim in the modern world.
Yet he continues training in order to defeat Shin-Ryong.

Ultimately, he prioritizes the goal of becoming stronger to defeat Shin-Ryong, while trying to adapt
to this modern world where he has a family and goes to a school like a normal person.

(Source: MU)