I can't confirm the specific name of the novel you mentioned because I can't search for all the published novels. However, based on the characteristics of the male protagonist's name, I can guess that the novel you mentioned might be Battle Through the Heavens or Martial Universe. These two novels were both popular online fantasy novels, in which the male lead's name had the word "Dou 'er". If you have more specific information or want to confirm if my answer is correct, please let me know.