The Line Watchers (2021)

Both dramas share some of the same actors and actresses. Line Watchers is about the lives of HK Custom officers while the Invisibles is about HK Anti-terrorist officers and the Phantom Tactical unit.

Similar vibes and productions. One is about airport and related stuff the other is customs amd smuggling.

A few cast were same.. Yeung Pik Sum suffers from Schizophrenia and her illness causes her son, Yip King Fung, to suffer from Dissociative Identity Disorder. King Fung’s split personality, Chu Kei, becomes a handwriting expert and criminal profiler, who helps King-fung, an undercover agent, to uproot a criminal organization. However, a series of strange cases makes King Fung a murder suspect and his younger sister to be traumatized. Feeling guilty about abandoning her children, Pik Sum becomes a mental hospital assistant to protect her daughter, but she is unable to reconcile with King Fung... Superintendent Lip Shan invites King Fung to join the Special Crime Unit. Together with psychiatrist Wai Yui Kit, bomb disposal expert Yau Ngan Sing, forensic anthropologist Fong Yuen Chin, they deal with criminals with abnormal psychological conditions and solve complicated cases.

Another civil servants drama by Benjamin Yuen, A story revolving around a policeman who becomes embroiled in a conspiracy plaguing the high-ranking officials due to an incident that almost cost him his life. PTSD haunts an inspector after facing a near-death experience. He would have never imagined that his nightmare was an accident, and that he would eventually join forces with the person who harmed him. Together, they try to take down the true villain. (Source: DramaPanda & Hotpot.tv)