He plans to spend time with his "uncle" Tang Ren (Wang Baoqiang), who is reputed to be the number one detective of Chinatown in Bangkok.

Tang Ren turns out to be a sleazy petty swindler who is an underling of incompetent police sergeant Kon Tai (Xiao Yang).

As it is kept in Huang's computer, Tang lures the police force away while Qin and Kon retrieve the footage and other documents about Sompat.

Following the trail, Qin and Tang are led to Snow (Zhang Zifeng), who was a school classmate of Sompat's son.

The pair delivers Xiang to the hospital and Tang revealed to Qin that his reasoning of staying in Thailand was that during his wedding day, he witnessed his wife having an affair with the groomsman and having lost his dignity with the whole village knowing about the issue, he left China to escape the pain.

Kon is subsequently promoted to deputy chief due to his prevention of the murderer's escape, to the annoyance of a severely injured Huang.

In addition to the two leads Wang Baoqiang and Liu Haoran reprising their roles, new supporting cast members in Detective Chinatown 2 include Xiao Yang, Michael Pitt, Natasha Liu Bordizzo, Yuen Wah, and Satoshi Tsumabuki.

[9] Premiering in January 2020, a web series starring Lin Mo (Roy Chiu) and Sa Sha (Zhang Yishang) expanded the Detective Chinatown universe.

In February 2024, a second season was also produced, featuring the return of Kiko (Yuxian Shang) from Detective Chinatown 2, who reprises her role as one of the main protagonists of the show.

Both seasons were made available exclusively on the subscription video on-demand over-the-top streaming service iQIYI.