Fred Cheng (鄭俊弘) promoted the theme song (鐵石心腸) of The Defected (鐵探) drama at radio station on 30th April 2019. Checking if Hubert Wu’s (胡鴻鈞) was supposed to sing the song but he was “frozen” by the company as he pointed he was better than Raymond Lam (林峯), Fred confessed he was notified at eleventh hour but was clueless about the reason. He defended Hubert that he was not an arrogant person and did not know if he was “frozen” by the company. When reminded about his girlfriend, Stephanie Ho’s (何雁詩) leg injury due to practising golf, Fred felt heart pain and she was currently undergoing physiotherapy. He also told her to be extra careful.