We can only make assumptions. It might have characters who were on the periphery of the main 'Pearl Boy' plot. Maybe a friend or a family member of the main character in the original story could be a main character here. They could be characters that were affected by the events in the main story but had their own story to tell which is now explored in this side story.
Since I don't have specific information about 'Pearl Boy Side Story', it's hard to say exactly who the main characters are. But if it's a side story, it could feature characters that are secondary in the main 'Pearl Boy' story and now get more focus.
Chapter 912, "Identical Four Pillars of Destiny?!", is the clearest early answer because it turns Wan Huixia's situation into a concrete plot event. It opens with But the repeated blows made Wan Huixia's husband lose his confidence...
Look to Chapter 2 for the clearest answer. It begins with On the top floor of the Financial Building, a gathering of dark clouds..., keeps building through How dare Jiang Li hang up his phone?, and lands on Jiang, Lin Manru, turned pale and quickly explained, "It's not eloping, my....
Chapter 902, "Sister, Please Have Your Meal", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. The chapter turns that into something concrete by moving from The college entrance exams over these two days took quite a toll on...
Chapter 743, "They Have Already Been Released", is the clearest early answer because it turns Fang Wenzhe's situation into a concrete plot event.
Chapter 893, "From today onwards, he is my half-brother from another father and mother!", is the clearest early answer because the buildup finally cashes out in a real clash. It opens with Jiang Yan still had unwavering faith in Daniu's character.
Chapter 549, "Is This How You Be a Brother?", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. It opens with Jiang Li led her group deeper into the island. and closes on You can eat dinner after you've chopped twenty pieces." Jiang Cheng:....
Chapter 805, "I Just Want to Eat a Big Chicken Leg!", is the clearest early answer because it turns Lin Manru's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The next day, the twins were much quieter.
Chapter 856, "Hurry and Stop Work!", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on Jiang Li looked towards the source of the commotion.
Chapter 942, "In Which Year Did the River Moon First Shine on People [Extra · River Moon Edition]", is the clearest early answer because it turns River Moon Edition's situation into a concrete plot event. Early on, She never expected Jiang Yan meant this..
Chapter 652, "He's Gu Shengrong's Grandson?!", is the clearest early answer because it turns Yu Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from The propellers lifted off again, and Team Q was already on their way...