One idea could be an OC who is a talented artist. She could use her art to bond with the brothers in different ways. For example, she might paint portraits of them, which could lead to some sweet and funny interactions as they react to how she's depicted them.
An OC who has a unique hobby like falconry. She brings her trained falcon into the family's life. The brothers, who have never encountered such a thing before, are both intrigued and a bit wary. This can lead to a series of events where they learn more about her and her hobby, and she in turn gets closer to each of them through their shared experiences.
Chapter 684, "It doesn't matter if it gets broken, I have the money to fix it.", is the clearest early answer because it turns Luo Xingmu's situation into a concrete plot event. The chapter turns that into something concrete by moving from But Jiang Li had already evolved;
Chapter 590, "Are You Angry?", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Night had completely fallen, and a chill hung in the air over Dragon...
Chapter 677, "Worshiping Sister While Avoiding Them", is the clearest early answer because it turns Lin Manru's situation into a concrete plot event. The chapter gives readers a real answer by opening on You should learn from your sister; she's made her own fortune and is...
Chapter 387, "Hello everyone, this is my disciple", is the clearest early answer because a shaky connection becomes usable in the plot. The chapter turns that into something concrete by moving from Liu Suqing V: "Even if we meet, I wouldn't recognize, faces covered...
Chapter 421, "Home Robbed", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with Mu Ye was originally a fitness trainer. and closes on We've struck gold!" Nina immediately looked at the newcomers with....
Chapter 415, "No Food, But Your Life", 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 Are you begging me for food now?
Chapter 588, "Looking like this, he must be a male model in a bar!", is the clearest early answer because it turns Crown Prince's situation into a concrete plot event. The chapter turns that into something concrete by moving from However, what they didn't expect was that Zhao Lang had actually...
Chapter 689, "Is the Soundproofing of This Private Room So Good?", is the clearest early answer because it turns Shang's situation into a concrete plot event.
Chapter 510, "The Fake Young Master", is the clearest early answer because it turns Gu Group's situation into a concrete plot event. Early on, Ever since that night's family banquet, Gu Qiang hadn't slept soundly....