Tang Tan 2 was released.

"Tang Tan 4" will be released. According to the information in the first document, it was known that Tang Tan 4 would be released in 2023, and Andy Liu might star in the movie. The second document mentioned that Tang Tan 4 was expected to be released during the Spring Festival in 2022. The third document also stated that Tang Tan 4 would be released in 2022. In addition, the fifth document mentioned that the release dates of Tang Tan 4 and 5 were 2022 and 2023 respectively. Therefore, according to the information provided, Tang Tan 4 would be released.

Tang Tan 1900 was scheduled to be released in the mainland of China in 2024. This movie was a new chapter in the " Tang Tan " series. It was set in 1900 and was filmed in China's Chinatown. Director Chen Sicheng was preparing for this comedy film, but the exact release date had not been determined yet.

The specific release date of Tang Tan 4 had not been announced yet. Although there were some reports and speculations, the official release date had yet to be announced. According to the audience and box office schedule of the Tang Tan series, it was likely that they would choose to release it during the Spring Festival in 2023. However, due to the inconsistent information in the search results, it was impossible to determine the specific release time.

Tang Tan 1's specific release date could not be found in the search results provided.

Detective Chinatown 1 was released in 2015.

Tang Tan 1900 was scheduled to be released in the mainland of China in 2024. Director Chen Sicheng was preparing for this comedy film, but the specific release date had not been determined yet.

Tang Tan 2 was released in China on February 16, 2018.

Detective Chinatown 3 was a comedy film directed by Chen Sicheng and was released in the mainland of China on February 12, 2021. The film tells the story of Tang Ren and Qin Feng who were invited by Detective Noda Hao to go to Tokyo to solve the case. The main actors included Wang Baoqiang, Liu Haoran, his wife and husband Mu Cong, etc. The film was a huge success in the pre-sales stage, breaking the record for the total pre-sales box office in the history of Chinese movies. It also set a single-week box office record for domestic movies within three days of its release. The accumulated reputation of the first two films in the " Detective Chinatown " series also brought the audience's expectations. Douban's rating was 6.1, with mixed reviews.

Detective Chinatown 2 was a the mainland of China film released in 2018. It was directed by Yao Wenyi and starred Wang Baoqiang, Liu Haoran, Xiao Yang, and Liu Chengyu. The plot was about Tang Ren tricking Qin Feng into going to New York to participate in the World Detective Competition for a huge prize. The two of them discovered a bigger secret hidden behind the competition. The movie was released on February 16, 2018.

Tang Tan 4 would be released in 2024. In the search results, there was an article that mentioned that Tang Tan 4 would be released on the first day of the Chinese New Year, and the main characters Wang Baoqiang, Liu Haoran, Zhang Zifeng, and Xiao Yang would all return. In addition, there was an article that mentioned that Chen Sicheng's " Tang Tanzhou " would have an untitled animated series about the detective case in Chinatown. The main creators were also Liu Haoran and Wang Baoqiang. Based on this information, it could be confirmed that Tang Tan 4 would be released in 2024.