Are you sure it's not the Australian accent that is throwing you off? I'm not from Australia, but I have in the past interacted with some Australian natives, and while we have a common language in English, the difference in accents did lead to misunderstandings on several occassions. I think she's fluent, but has an accent, which is fine, considering Australians think of Americans as also having an accent. I too would like to hear her converse a bit more in English; to fully determine her level of proficiency for one thing, but more so because I like hearing her cute accent. :D

I think she IS fluent in English, but she clearly has an Australian accent, which is natural being as how she was schooled there. Try listening to her English version of the song while looking at the lyrics, you'll see that her English is actually pretty good here. And I didn't notice any mumbling, more like the lyrics being sung quickly to keep up with the beat of the song. I think she did a fair job with the cover, her voice could benefit from some training, but it was a nice effort overall.
___________________________________
I Love Rock N' Roll
(J. Hooker/A. Merrill)

I saw him dancin' there by the record machine
I knew he must a been about seventeen
The beat was goin' strong
Playin' my favorite song
An' I could tell it wouldn't be long
Till he was with me, yeah me, singin'

I love rock n' roll
So put another dime in the jukebox, baby
I love rock n' roll
So come an' take your time an' dance with me

He smiled so I got up and' asked for his name
That don't matter, he said,
'Cause it's all the same

Said can I take you home where we can be alone

An' next we were movin' on
He was with me, yeah me

Next we were movin' on
He was with me, yeah me, singin'

I love rock n' roll
So put another dime in the jukebox, baby
I love rock n' roll
So come an' take your time an' dance with me

Said can I take you home where we can be alone

An we'll be movin' on
An' singin' that same old song
Yeah with me, singin'

I love rock n' roll
So put another dime in the jukebox, baby
I love rock n' roll
So come an' take your time an' dance with me
___________________________________

You'll notice some of the lyrics were altered. I really like the Korean version though - her voice sounds sweet and sexy at the same time, at least to me. :D

magchung-
I'm a Cal alum, too, so I just enjoyed watching my husband cringe at the "supposed" Stanford campus. You can imagine our house at Big Game time. At least, he and I are on the same side when it comes to USC. Down with the Trojans! GO BEARS!!!

good try LDH...yah pretty much a unanimous decision across the board...actress = yes!, singer = highly unlikely; her voice definitely cant handle such an upbeat and commanding song...mayb ballads would suit her voice better

I was lucky enough to see Minwoo when I was in Korea. Yes he is quite short but very tan and handsome.
My friend suggested we stop in this CD shop and turns out Minwoo was coming to have a signing. I was way too nervous to actually get in line to get my CD signed,though. I really regret not doing it now:(

i heard the english version and only caught the words "I love rock and roll" and something "seventeen"....argh!!!

oh my.. LDH is my favorite gal.. but yes.. i think she should just stick to acting. I just saw one of her videos.. and her dancing is abit off for me.. ehhe.. no matter what.. i adore LDH to bits.. so i'll take it as she's having fun and this is a one-time thing? hahahaa.. I wouldn't say that her singing is "awful"- not good.. but she's my favorite LDH.. ehhe.. i adore her singing in my girl.. but I have to say.. she is not "great" enough to be a singer ( yet).. that's all.. ehehe.. but wow.. who decides on this song for her? and the music video too!! Awful music video.. yikes!! She looks great - I'll say that.. but whoever puts that music video together - tsk tsk!!

I didn't think her English was that bad... I could understand most of it... and what I couldn't was because her accompaniment drowned her out. Plus, I've heard MUCH worse attempts by other Asian artists, so I'll cut her some slack. Just listen to Jimmy Lin trying to sing Elton John's, Your Song to see what I mean. Compared to him, she's like an 8, lol: http://youtube.com/watch?v=ZtChKgnQOso

But yes, I agree. She should stick to acting.

I agree with you. Personally i think the song was too big for her, like the music was so loud, you could barely hear her over the music, and she's very nasally. Don't get me wrong though, i love her as an actress, but let's just say, i hope she doesn't quit her day job and decide to become a fool blown singer.