Well, without more context, it's difficult to say precisely. It might be a story set in a gothic world where the black rose is a sign of the dark and supernatural. For example, it could be about a cursed family and the black rose is the key to breaking the curse. It could also be a historical tale where the black rose was used in some secret society's rituals or was a symbol of a rebellion.
I'm not sure specifically what the 'Black Rose Story' is about as there could be many stories with that name. It might be about a black rose, which could symbolize mystery, love, or death in different cultures.
A practical answer is Chapter 22, because it turns the idea into a concrete scene. The chapter opens with Hearing this, Su Yinwan looked at Shang Shaojing with a face full of..., adds pressure through Why are you yelling so loudly?, and ends on Jiang Li's righteousness temporarily shut Jiang Yan.
Look to Chapter 55 for the clearest answer. It begins with Su Yinwan hadn't expected that, in just one day, Jiang Li's reputation had..., keeps building through Yet she was clearly the wretched cannon fodder of this book., and lands on He Yun's fans were immediately displeased..
A practical answer is Chapter 22, because it turns the idea into a concrete scene. The chapter opens with Hearing this, Su Yinwan looked at Shang Shaojing with a face full of..., adds pressure through Why are you yelling so loudly?, and ends on Jiang Li's righteousness temporarily shut Jiang Yan.
If you want the clearest chapter reference, go to Chapter 17. Early on, Jiang Li glanced at Jiang Shixu, who was tense and anxious behind her, and...; later, the chapter leans on Okay, let's go eat." After speaking, she strode forward..
If you want the clearest chapter reference, go to Chapter 11. Early on, After a meeting, Shang Shaojing pinched the bridge of his nose, tired, and...; later, the chapter leans on How is it going with the Jiang Family?" The assistant looked troubled and....
If you want the clearest chapter reference, go to Chapter 23. Early on, Although Jiang Li exerted very little strength, Jiang Yan instantly felt...; later, the chapter leans on The pain twisted his face grotesquely as he dove headfirst into the sofa..
Chapter 25 is the strongest chapter-level answer because it starts from Therefore, from his childhood, Jiang Shixu had felt an extreme aversion to... and follows through on Having worked beside Shen Lan for over a decade, she had been there when....
The best chapter pointer here is Chapter 68, "She finally managed to win a round back!". It opens with Jiang Li carried the noodles straight out of the kitchen and came to the... and closes on But didn't Uncle Zhao say he was still sick?.
The best chapter pointer here is Chapter 61, "Young Master Before vs After Going to the Countryside". It opens with Hahahaha, oh my god, Jiang Li's mouth is even more venomous. and closes on A cold shower is pretty normal, right?.