Theme song name: Ten Brothers
Sung by: Frankie Lam & Kenix Kwok
It is a beautiful song, and if you understand the lyrics, you will find it meaningful. Frankie and Kenix made a lovely duet together, or is it just me? XD
The full version is nicer than the theme, and that's a fact. If you want the songs, you can go to K for TVB to get them. Just use the CTL + F key to search.