In March 2019, Raymond Lam (林峯) announced he would be filming TVB new drama, Line Walker 3 (使徒行者3) during the press conference and the shooting is finally commencing in August. Other than the main cast team members including Michael Miu (苗僑偉), Benz Hui (許詔雄) and Raymond, the members list is not finalised yet and Charmaine Sheh (佘詩曼) rejected it because of her schedule. Hence, there are many speculations about the female lead role and Ali Lee (李佳芯) and Sisley Choi (蔡思貝) are rumoured as the candidates. Lately, Raymond recommended Miss Chinese International Pageant 2017’s runner-up (2017年國際中華小姐競選), Serene Lim (林宣妤) to play the female lead role.

Since joining TVB in 2018 and enrolling into the acting classes in October and December 2018, Serene is given an opportunity to film Girlie Days (她她她的少女時代) and Al Cappuccino (極道怪咖) drama. During the pageant, she was perceived as the hot favourite and heavily groomed by TVB, but lost to Stitch Yu (余思霆) eventually. However in terms of the appearance and elegance, Serene is as outstanding as Stitch and has a combination of Karena Ng (吳千語) and Angelababy’s (杨颖) faces at the time.

During an interview with HK01 (香港01), Serene admitted she was one of the cast team members in Line Walker 3 series: “I have scenes with Raymond (What is your role character?) I play a traditional Chinese physician and staff in foot massaging shop. (Do you remember the ending in Line Walker drama? Charmaine owns a foot massage shop.) I am not the female lead and cannot reveal too many details now. Anyway, I have prepared my homework and have gone for one massage lesson.” She added the filming would be commencing in this August and declined to reveal the details about the female lead, but Sisley would be one of the cast team members.