In May 2023, Hacken Lee collaborated again with the Hong Kong Philharmonic Orchestra for a concert series at the Hong Kong Coliseum. The Cantopop veteran serenaded audiences with impeccable performances of his classic hits like "Red Sun," "Moonlight Serenade," "I Don't Know How to Sing," "Summer Myth" and "Deep Deep Deep." Sing! China Season 6 and Season 7 winners Karrie Ng and Sumi Liang, who were both mentored by Hacken in the program, appeared as guest artists for the concert.