I recommend the book "The Last Innocence in the World of Cultivators" to you. The male protagonist, Xu Zhe, is the last innocent person in the World of Cultivators. He has super self-discipline, an honest and cute personality, and is exactly the kind of innocent male protagonist that meets your requirements. This book was also a pure cultivation novel. The female protagonist abandoned the practice of pretending to be a pig to eat a tiger in reality during her cultivation. She grew up step by step and finally succeeded. I hope you like this fairy's recommendation. Muah ~๐