It must be a typo of the credits.
According to credits she is Ho Ting-Si (I created her entry), but according to poster (DVD cover) she is Ho Ting-Yan.

Merged:
???
Ho Ting-Si ?


Filmography (2000)

Actor (1 film)
What Is a Good Teacher (2000) ... Connie Tse Suet Fan

and

???
Ho Ting-Yan ?
Aliases: Tammy Ho

Filmography (2001-2003)

Actor (4 films)
Never Say Goodbye (2001) ... Carmen
Heroic Duo (2003) ... University student
Dream & Desire (2003) ... Barbie
News Heart (2003) ... Wah

No problem - sometimes I have a good "nose" for such double entries (I did not search those either)
But "passing by " looking those very similar names made me bit of curious...