Chang Yuk-Lung (???), Tsang Kin-Yan (???), Cheng Yu-Long (???) and partly Tseng Yu-Lung (???) are the same person.

1) Chang Yuk-Lung = Tsang Kin-Yan
Chang Yuk-Lung appears in "Sleeping with Two Sisters", "Fatal Love" and "Kui Hua Bao Dian", but his name -
??? - is not in the credits, and if in first 2 movies he has a supporting role, in the 3rd movie he has a leading role, while the cast of "Kui Hua Bao Dian" is very limited (only 7 actors). The name that is credited in all these movies is ???. You can also see, that in first 2 movies Chang Yuk-Lung was identified from the portrait galleries, so the name "Chang Yuk-Lung" is at the end of the cast list.
And here he is in "Kui Hua Bao Dian":

Couldn't check "The World of Desire" though.


2) Chang Yuk-Lung = Tseng Yu-Lung
Chinese names are similar, ??? = ???, only the last character is different, but same pronunciation.
3 movies are credited for Tseng Yu-Lung:
The Sea in Blue (1974)
Love Needs No Sorrow (1974)
I Am Not in Love (1998)

I couldn't find copies of the first two movies from 1974, so can't judge about them, but here is Chang Yuk-Lung in "I Am Not in Love":


So I suggest to move credit of "I Am Not in Love" to the page of Chang Yuk-Lung + adding an alias (???), and leave the current entry of Tseng Yu-Lung with 2 credits from 1974.


3) Chang Yuk-Lung = Cheng Yu-Long
Again, similar names - ???=???, one different character, but same pronunciation.
The only movie credited for Cheng Yu-Long is "I Am Not in Love". This name doesn't appear in credits of the movie, only on a VCD cover. And we know, that Chang Yuk-Lung appears in that movie.


Please change and merge

If nobody stops me in 15 days I will merge and change them.

Merged

???
Chang Yuk-Lung ?
Aliases: Tsang Yuk-Lung






Filmography (1993-1999)

Actor (13 films)
Sleeping with Two Sisters (1993)
Fatal Love (1993)
Xiang Guo Qu Jie Zhong (1994) ... [Uncredited]
Lethal Extortion (1994)
Kill for Love (1996)
Pink Killer (1996) ... [Uncredited]
Against (1997) ... [Uncredited]
Dangerous Relationship (1998)
Wild Flower (1998) ... Husband of pregnant woman
Change (1998) ... New lover of Casanova's girlfriend
Sex Games (1998)
Killing Thriller (1999) ... Rapist [uncredited]
Fire Storm (1999) ... [Uncredited]

and

???
Tsang Kin-Yan

Filmography (1992-1993)

Actor (4 films)
The World of Desire (1992)
Fatal Love (1993)
Sleeping with Two Sisters (1993)
Kui Hua Bao Dian (1993)

and

???
Cheng Yu-Long
Aliases: Chang Yu-Lung

Filmography (1998)

Actor (1 film)
I Am Not in Love (1998) ... [Uncredited]

and

???
Tseng Yu-Lung

Filmography (1974-1998)

Actor (3 films)
The Sea in Blue (1974)
Love Needs No Sorrow (1974)
I Am Not in Love (1998)