I'm not sure there's a direct connection. Gossip Girl is typically about drama and social life, while psycho killer is a much darker theme. Maybe it's a very unique crossover concept in some manga.
Not really obvious. Gossip Girl is known for its fashionable and social aspects. A psycho killer aspect might be added for shock value or to add a thriller element to the story. But it's hard to predict exactly how they'd be related without seeing the specific manga.
Chapter 492, "Rewarding You with Some Wild Vegetables", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with Upon hearing the words, Jiang Cheng's face instantly turned pale.
Chapter 159, "The Other Flying Guest is Actually Him?!", is the clearest early answer because it turns Tian Run Group's situation into a concrete plot event.
Chapter 310, "Sister, Eat More", is the clearest early answer because it turns Grandpa's situation into a concrete plot event.
Chapter 564, "Why Only 80 Points?!", is the clearest early answer because it turns Chen Manman's situation into a concrete plot event. It opens with Miss Jiang, what do you need this time?" He Pingzhang's tone was not...
Chapter 368, "You Don't Deserve to Be My Mother", is the clearest early answer because it turns Du Qinglian's situation into a concrete plot event. The chapter gives readers a real answer by opening on I haven't detained anyone, how could I possibly detain him?
Chapter 286, "I Won't Let Anything Happen to Either of Us", is the clearest early answer because it turns Either's situation into a concrete plot event.
Chapter 371, "Oh, Isn't This an Old Acquaintance?", is the clearest early answer because it turns Shu Yan's situation into a concrete plot event. The chapter turns that into something concrete by moving from #He Yun Thanks Jiang Li# #He Yun Bows# #LiHe CP# The interview wasn't...
Chapter 639, "Young Master Gu, Does Your Family Need a Dog?", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter turns that into something concrete by moving from Half an hour later, Jiang Li pushed open the door and walked out.
Chapter 539, "Aren't these the two who bullied Bai Lu before?!", is the clearest early answer because it turns Lu Hu's situation into a concrete plot event. Early on, On the other side of the jungle, Zhao Lang, who was trekking with all....
Chapter 720, "A Bastard Child Behaving So Arrogantly?", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter turns that into something concrete by moving from As finals approached, with a wave of his hand, Jiang Li sent Jiang...