As the soundtrack of Old Time Buddy (難兄難弟) sang by Francis Ng (吳鎮宇), Gallen Lo (羅嘉良), Jessica Hsuan (宣萱) and Maggie Cheung (張可頤) received good results at the time, Francis tried to sing the song for new drama (使徒行者:諜影行動) on 6th January 2018 and it reminded him of distributing the sales around 7 digit between 4 of them. However, he had no intention to sing again: “It is rare that the showbiz tolerates us and the tolerance does not represent easy going. I have no preference after going back. (Look for Louis Koo (古天樂) to sing the song (男朋友) together?) Yes. We must wear bathrobes and sing the hehe version. We must sing together with Nick Cheung (張家輝) too and heard that both fought for newcomer award at the point. (You dare to challenge Louis as he is the biggest winner?) As I said before, we must not take others’ tolerances for granted.”

Source: https://ol.mingpao.com/php/showbiz3.php?nodeid=1546772923339&subcate=latest&issue=20190106