The theme song for SSSS is "At This Moment" (此時此刻), sung by Fiona Sit.
Fiona is a bit of a surprise choice but glad that TVB is finding some quality singers for their theme songs.
The subtheme song is called "Sometimes" (有時), sung by Ron Ng.
I agree with Hyn that the song does sound a bit modern, but I still like it :D I'm really looking forward to the full version!
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