The Dragon and the Knight's Unusual Rules [Reborn]

Just after killing his nemesis, Qin Zhongyuan was flung into the past, where he also picked up his poor, miserable little nemesis. There was more to his return to the past than met the eye. Qin Zhongyuan investigates at every turn, and only when the child he raised with his own hands regains the memories of his previous life does the hidden truth behind the entire magical continent begin to come to light. Qin Zhongyuan teams up with his mortal enemy from his previous life to level up and fight monsters. Before they know it, they have both become saviors of the world. Qin Zhongyuan and Lin Xun: We were only trying to get revenge... Both top and bottom are reborn. The bottom isn't truly a scumbag, and he'll be redeemed. Theme: Raising a scumbag into a good person