One idea could be that OC has been secretly dating a woman who works in the same precinct but in a different department. She could be a forensic scientist. They meet in the coffee room one day, accidentally spill coffee on each other, and that's how it starts. They keep their relationship under wraps because they don't want office gossip to interfere with their jobs.
In the fanfic, OC's secret girlfriend could be a journalist. She meets OC while covering a case. They start to secretly date as OC is worried about how it will look if it gets out. They have secret rendezvous at quiet cafes or in the park at night. Their relationship is filled with tension as they both try to balance their respective careers and the secrecy.
Perhaps OC's secret girlfriend is a victim of a past case that he worked on. She was so impressed by how he handled her situation that she sought him out after the case was closed. They began a relationship in secret. They often have to be careful when they meet, especially when around people who might recognize her from the case. It adds an extra layer of mystery and drama to their relationship.
Chapter 727, "Can't Keep Up with the Twists Anymore", is the clearest early answer because it turns Jinli Studio's situation into a concrete plot event. It opens with Jiang Li only posted one picture, but it shut up those haters.
Chapter 665, "Give You a Good Lesson on Behalf of Your Mother!", is the clearest early answer because it turns Sister Liu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Why should I get so many points?
Chapter 707, "I am Daoist Qingfeng", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Su Yinwan hadn't finished her dessert but, feeling agitated, had...
Chapter 721, "Apology", is the clearest early answer because it turns Sha Shaohong's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Li's car had just passed a traffic light when a phone call...
Chapter 837, "Why did she come?!", is the clearest early answer because it turns Gu Shengrong's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The ring is the one Shi Lei just gave her, she really likes it, so...
Chapter 528, "Cursed", is the clearest early answer because it turns Shang Shaobai's situation into a concrete plot event. The chapter gives readers a real answer by opening on The netizens almost unanimously started to sympathize with Jiang...
Chapter 563, "Quite the Confidence", is the clearest early answer because it turns Chen Manman's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Upon learning the result, the four of them stood frozen on the spot,...
Chapter 551, "Who is Reciting "Student Rules"?", 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 Other competitors were already in place, and Qi Tianyu was the last...
A practical answer is Chapter 23, because it turns the idea into a concrete scene. The chapter opens with Although Jiang Li exerted very little strength, Jiang Yan instantly felt..., adds pressure through So the moment the news broke that Jiang Li was entangling with Shang..., and ends on However.
Chapter 705, "Is She Her Own Destined Noble Person?!", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with He Wen was made to laugh by Bai Lu. and follows through with So he's just a side character, huh..