It could symbolize something in his backstory that wasn't explicitly shown. Or it might have been a way to make him stand out visually. We don't have a definite reason given in the movie.
Maybe it was just a random style choice for his character. Could be to add a bit of mystery or quirkiness.
Look to Chapter 10 for the clearest answer. It begins with Qiao's shocked face struggle to recover, Lin Manru also tasted for the..., keeps building through Jiang Li nodded with a smile, seemingly approving of Lin Manru's words and..., and lands on Who was it again saying that the Jiang Family's.
Chapter 916, "Not Biological?!", is the clearest early answer because it turns Wanzhi's situation into a concrete plot event. The chapter turns that into something concrete by moving from Bang," Hong Pei slammed the teacup onto the table.
A practical answer is Chapter 57, because it turns the idea into a concrete scene. The chapter opens with Lu Xingchao's numerous fans were stunned., adds pressure through Do you even consider me your brother?, and ends on I'm saying, big bro, can you at least reply to me?.
Chapter 11 is the strongest chapter-level answer because it starts from After a meeting, Shang Shaojing pinched the bridge of his nose, tired, and... and follows through on Miss Qin, please accompany us to the police station to explain this....
The best chapter pointer here is Chapter 14, "She Looks So Cool Dancing with a Gun". It opens with Lin Manru had a rare good night's sleep. and closes on But clearly, Lin Manru was unable to accept that her delicate daughter had....
Look to Chapter 20 for the clearest answer. It begins with Several people turned their heads upon hearing the sound and saw three..., keeps building through She was clad in a long black dress, and the dull color did not hide her..., and lands on So, he turned and questioned Jiang Li..
A practical answer is Chapter 9, because it turns the idea into a concrete scene. The chapter opens with Exactly, the Qiao Family isn't that great either., adds pressure through Since it was for the Jiang Family's welfare, then as the matriarch, she..., and ends on Qiao, unable to save face.
The best chapter pointer here is Chapter 11, "She Smiled, He Panicked". It opens with After a meeting, Shang Shaojing pinched the bridge of his nose, tired, and... and closes on Miss Qin, please accompany us to the police station to explain this....
If you want the clearest chapter reference, go to Chapter 24. Early on, Not only that, even the non-mainstream photos she had previously posted on...; later, the chapter leans on Phrases such as "ugly girl craving swan meat," "arrogant, wasteful....
Chapter 937, "When Did the River Moon First Shine on People [Extra: River Moon Chapter]", is the clearest early answer because it turns Teacher Meng's situation into a concrete plot event.