On March 17th, the premiere of the crime drama "The Watcher: The Road of Sin and Error" directed by Fei Hang and starring Simon Yam, Jingchu Zhang, Shengyi Huang, Sicheng Chen, Lei Hao, Shaqun Yu, Zi Wei and others was held in Beijing. The performer of the main theme song "Floating Light", Chusheng Chen, also attended to support the event. The tango performed by Sicheng Chen and Jingchu Zhang in the movie is one of the biggest highlights of the film. Although Jingchu Zhang was unable to attend on that day, the impromptu dance by Sicheng Chen and Shengyi Huang made up for this regret. Hao Lei, who refused to dance with Chen, also declined interviews from any television stations that day.
Shaocun Yu and Shengyi Huang appeared perfectly coordinated in silver evening gowns. According to Shaocun Yu, he decided to take part in the movie due to his admiration for Shengyi Huang. The two of them presented a romantic love story amidst the somber tone of the film, which became one of the highlights. "We shouted wildly in a jeep under the snow-capped mountains in Yunnan, it was worth it," said Yu. It is reported that in the movie, Yu's character is a science college student who appears weak but is the first to discover the entire conspiracy. Shengyi Huang also mentioned that before filming, she felt like she was in a "romance with an older man" with Yu, but his performance in the movie changed her mind. Yu jokingly said, "I am absolutely her elder brother now."
Shengyi Huang volunteered to perform the tango with Sicheng Chen. In the movie "The Watcher: The Road of Sin and Error," the four-minute dance scene between Chen, playing a wandering man, and Zhang, playing a charming boss lady, is another major highlight of the film. As Zhang was in the United States for studies and could not attend, Chen invited other female actors from the play to dance with him. Before Chen could even ask Hao Lei, she refused, saying she couldn't dance today or her wig might fall off. Seeing Chen's slight embarrassment, Huang volunteered to dance with him. With ten years of dance foundation, Huang danced gracefully while Chen accompanied her from the side. Although their coordination wasn't perfect, they still elicited continuous applause from the audience. The director joked that this tango was more like a confession, and when asked about his reputation, Wei only had two words, "Not good at all."
Chen revealed his "air stewardess complex." He disclosed that his character in the movie was not a bad guy but someone who "did bad things with good intentions." To recreate the process of the film, Chen had a remote conversation with Simon Yam, who was on a flight to France and could not attend. Unpredictable as always, Chen improvised on the spot, revealing that he has an "air stewardess complex." Chen mentioned during the event, "I really like air stewardesses, but I don't like them serving foreigners."