Rebirth; Childhood Sweetheart Development System

"If you could, how old would you be back?" Luo Xi playfully read what he thought was a fake advertisement and casually typed "6" on his phone. "Why?" Luo Xi laughed dryly, complaining that this advertisement was really serious. But he still typed "because it is easiest to cultivate childhood sweethearts when you are six years old." Suddenly, he was really reborn, and he even came with his own system! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.