Traveling Across the Heavens, I Can Sell Regret Medicine

Lin Cheng is bound to the reversal of time and space system and improves his abilities by selling regret medicine. And the first target is the world of pirates. "Luffy, what is the thing you regret most in your life?" Immediately afterwards, he came to the world of Naruto. "There are so many, what is your biggest regret?" ........ From then on, he traveled through the world of the heavens, constantly selling his regret medicine. Until one day, he had a dream... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.