No, it's not. Wicked Little Letters is likely a fictional creation rather than based on real events.
Most probably it isn't a true story. It might be purely imaginative or inspired by various fictional elements rather than actual happenings.
I don't think it is. Usually, such titles indicate a work of fiction. But without specific knowledge about this particular one, it's just a best guess based on common naming conventions for fictional works.
Chapter 52, "Intensified Contradictions [Breaking 1000 Thanks!]", is the clearest early answer because it turns Redwood Ridge's situation into a concrete plot event. The setup is At nightfall, from the time they left Rogel Camp until now., but the pressure keeps building through For more than two hours, that Wood Puppet Monster still hadn't shown....
Chapter 76, "Everyone Can Cultivate", is the clearest early answer because it turns Redwood Ridge's situation into a concrete plot event. The chapter gives readers a real answer by opening on Brother, what do you think of my proposal?" Xia Hong, who was... and ending on Xia Hong was not blaming these people..
Chapter 14, "The Regular Cast", is the clearest early answer because it turns Cold Beast Flesh's situation into a concrete plot event. The chapter gives readers a real answer by opening on There is a convention among the camps surrounding Redwood Ridge. and ending on Thus, transplanting Ice Trees became almost impossible..
Chapter 522, "Massacre In The East Base", is the clearest early answer because the violence around Damien becomes final instead of hypothetical. The chapter turns that into something concrete by moving from There was no organized ranks nor was there a marching formation. to A presence had been added to the mix..
Chapter 136, "He Yuanhun, Yuwen Hu, Yuwen Dao (Three in One)", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. Early on, Adding to the subtle expression on Yuwen Dao's face, it was evident.... By the end, If he couldn't break through to the Cold Resistance Level in a short....
Chapter 105, "New Home Construction, Strength Bottleneck [Two in One]", is the clearest early answer because it turns Cold Beast's situation into a concrete plot event. A useful checkpoint is the way the scene starts with When the new house construction idea was first proposed, Mu Dong... and follows through with Currently known human threats are limited to the camps of Lu Shang....
Chapter 110, "Must Take Action Immediately", is the clearest early answer because it turns Teng Jiao's situation into a concrete plot event. The chapter gives readers a real answer by opening on Run!" In such a predicament, there was no other choice left. and ending on Even if a fight broke out between the Teng Jiao and the Rodent group,.... In story terms, the chapter closes with "The northern slope is only two kilometers from the valley here.
Chapter 133, "Natural Trench", is the clearest early answer because it turns Snow Mane's situation into a concrete plot event. The chapter gives readers a real answer by opening on On the western side, deeper into the Redwood Ridge. and ending on Over the past six months, the fifteen of them had followed him for....
Chapter 105, "New Home Construction, Strength Bottleneck [Two in One]", is the clearest early answer because it turns Snow Mane's situation into a concrete plot event. Early on, The outskirts of Redwood Ridge, at a boundary of five hundred meters.. By the end, The Snow Mane's pupils lost their fierce gleam, and the long tongue,....
Chapter 166, "The Defenseless Mirror Immortal", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. It opens with Xia Hong, my leader, among our three thousand people, none have paid... and closes on Moreover, if He Yuanhun wins, it's a dead end for us all..