Regression of the Shattering Sword

As the hated Great World Killer Jin Cheonrang draws his last breath, he learns the terrible truth that his long-lost son took his own life out of shame for his father. So when he wakes up to find himself alive in his son Namgung Cheon's body, he is determined to give Cheon a better life. Now, he's ready to take on proud clan heads and cruel bullies using his trusty martial skill copying technique. Can this skill breaker bring honor to his son and clan, or will his shameful past break him first?