After 6 years later, Raymond Lam (林峯) returns to TVB to film Line Walker: Bull Fight (使徒行者3) drama and sings the theme song (無人問我), after Flying Tiger (飛虎之潛行激戰) in 2018. Other than that, he also sings duet (低谷天堂) with Hana Kuk (菊梓喬) and the MV is officially released a few days ago, but it receives criticisms instead.

The shooting of the MV for the song (無人問我) is taken place in Taiwan and Owen Chow is the MV director. Taiwanese artistes Chang Kai Yi (張楷奕) and Yawei Chang (張雅惟) played the leads and Raymond appeared in the ending for 5 seconds. Hence, many netizens felt disappointed as the story was unrelated to the series plot and some hoped Raymond will appear longer in the MV (低谷天堂) with Hana. They criticised: “It is weird to invite 2 strangers unrelated to the series and better to edit the drama in the MV. Raymond is not around yet you call it as an official MV? Lousy! Raymond sings very well and might as well not to film this MV.”