Raymond Lam (林峯) announced he would be making a comeback in TVB by filming drama and holding concert on 18th March 2019. During the 2019 Filmart (香港國際影視展), he revealed he would be playing the male lead in Line Walker 3 (使徒行者3) drama produced by Tencent Video (騰訊視頻) and Tencent Penguin Pictures (企鵝影視). As Benz Hui (許紹雄) and Raymond were present at the same event, Raymond explained he begun to have vision in his mind upon listening to the plot and realised his role character, Bao Seed (爆Seed) had many different areas which enriched his experiences. Hence, he agreed to film the series and one of the location shootings would take place in overseas. When asked if Charmaine Sheh (佘詩曼) and Jessica Hsuan (宣萱) would be participating in the drama again since they worked for the same company, Raymond replied they were very busy and it depended on the company’s arrangement.
TVB senior management, Felix To (杜之克) expressed the third sequel marked the final ending for the first two instalments which explained many unsolved mysteries.
Asking if Benz would be playing a villain again, he replied it was unpredictable and a villain might be disguising as a good man.