I did this song in Mandarin yesterday, so why not? I couldn't find any lyric videos for this one in Cantonese.
My first attempt at translating Cantonese. :s Likely full of errors.
I know this romanization is a bit harder to figure out, but it's the one I'm used to. It'd be a pain to explain the entire thing here, but some of the harder components:
"j" is pronounced as "y" (so "jiu" sounds like "yiu")
"oe" doesn't really have an equivalent in English, but it's sorta like "uh" ("soeng" is sorta like "sung," but not exactly)
"eoi" is another one that doesn't show up in English. The closest sound would be "oy" as in "boy."
"z" is similar to"j" ("zi" = "ji")
"c" is sorta like "ch" but softer. Closer to "ts" actually. ("cin" = "chin" or "tsin")
Haha, I know it seems complicated (plus I'm bad at explaining things), but again, I'm used to it.