Archive of Our Own (AO3) is a great place to start. It has a large collection of fanfiction from various fandoms, including Famous in Love. Just use the search function and type in 'Paige and Rainer' to find relevant stories.
Fanfiction.net also might have some. Although the interface might not be as modern as AO3, it still has a vast amount of fan - created content. You'll need to search specifically for Famous in Love and then narrow it down to Paige and Riner stories.
If you want the clearest chapter reference, go to Chapter 193. Early on, Jiang Shixu's eyes lit up when he heard there was a gift.; later, the chapter leans on But the next second, he carefully asked, "Is this gift for everyone?" "No,....
If you want the clearest chapter reference, go to Chapter 230. Early on, Shang Shaojing's expression wasn't looking too good either.; later, the chapter leans on He had always been the winner in any field, and there had never been an....
If you want the clearest chapter reference, go to Chapter 211. Early on, Advanced Repair was even more outrageous, costing a whole 30 points.; later, the chapter leans on Not to mention the 50 points for Supreme Repair..
The best chapter pointer here is Chapter 185, "We Are the Real Team". It opens with He was so anxious that he immediately picked up the megaphone. and closes on The next, she'd complain that the ground was too slippery to walk on..
Chapter 216 is the strongest chapter-level answer because it starts from The production team also took advantage of the situation to start an... and follows through on However, the next second, He Yun, who had hardly ever spoken to him,....
The best chapter pointer here is Chapter 157, ""Forced onto Liangshan". It opens with It was already the last day of Flash Change in his dream. and closes on I'm laughing myself crazy, do actors all have such strong conviction?]....
A practical answer is Chapter 192, because it turns the idea into a concrete scene. The chapter opens with Jiang Shixu had never imagined that Jiang Cheng, who had been so arrogant..., adds pressure through Let this incident pass, don't dwell on it and hurt yourself., and ends on Jiang Li.
A practical answer is Chapter 190, because it turns the idea into a concrete scene. The chapter opens with Several people who didn't understand fell silent., adds pressure through And it became even more repugnant to him., and ends on Because he saw the pack of cigarettes pinched between Jiang.
A practical answer is Chapter 182, because it turns the idea into a concrete scene. The chapter opens with At this moment, Qi Tianyu, who had just arrived in the Capital, couldn't..., adds pressure through So, when it came time to draw lots, she effortlessly drew a ball of the..., and ends on But.
If you want the clearest chapter reference, go to Chapter 160. Early on, As the sky gradually darkened, the originally mild drizzle began to...; later, the chapter leans on Jiang Li looked up at the sky and turned to the people behind him and....