I'm not sure specifically as there could be many different 'Crimson Rivers' Harry Potter fanfics. Generally, it might involve new adventures in the Harry Potter universe, perhaps with a focus on a mysterious 'Crimson Rivers' element. It could be about new characters related to it, or a new plotline that twists the original story in a way related to these crimson rivers.
One interesting story could be about the characters solving a mystery that was not fully explored in the original work. For example, they might discover a hidden society within the town that has been causing all the strange events.
One idea could be a prequel fanfic that delves into the backstories of the main characters before the events of the original. For example, exploring their early days in the police force or their first encounters with the strange cases that would later shape them.
First, re - watch or re - read the original Crimson Rivers to get a good feel for the characters, the setting, and the overall mood. Then, think of an idea that you are passionate about, like a new adventure for the characters or a different take on an existing plot.
Think about the story you want to tell. Is it a continuation of the existing plot? Or something completely new? Decide on the main plot points, like the mystery or conflict your characters will face.
You can try looking on popular fanfic websites like Fanfiction.net or Archive of Our Own (AO3). They have a vast collection of Harry Potter fanfics, and you might be able to find the 'Crimson Rivers' one by using the search function on those sites.
In the finale of the TV series " Rivers and Waters," Jiang He finally got together with Lucy. Lucy was an editor-in-chief. She had a lively personality and was very righteous. She had always liked Jiang He and treated him well in silence. Lucian shared the same worldview and spiritual world as Jiang He, and she supported his work and did her best to help him. Slowly, Jiang He fell in love with Lucy as well. Hence, Jiang He and Lucy became the ultimate couple.
Jiang He Shui's cast list included Qin Hao, Han Qing Zi, Guo Tao, and other leading actors. Among them, Qin Hao played Jiang He, Han Qing Zi played Lu Qian, Guo Tao played Qin Chi, Che Xiao played Ding Weiwei, and Zhang Li played Shen Yiwei. The cast list of this TV series also included the introduction of other characters, such as Ding Huai, Liu Xiya, Qin Haitao, and Yina.