The Legend of Dragon Roan Tribulation

(Han Fanger novels, Xianxia series) Because the seal that sealed the Tao was loose, he, the ancient divine dragon, went to the place where the Tao was sealed and met the fish tribe princess dressed in red. From then on, the beautiful figure in red was engraved in his heart. However, he was approaching disaster and had to fall into the mortal world to go through hardships and save all sentient beings. But she got married to another person in the mortal world. From then on, he tortured himself in the immortal world and cried to himself. In the end, he went through all the troubles to finally achieve consummation with her.