I normally don't try to mod other people's maps, mainly because I don't think I have the required skills, but this time it's special because it's a Cantonese song, and you are also from Hong Kong like me XD
A few suggestions:
It seems that the volume of the music is too soft for me. I don't know if it's only me or what, but I think using the soft sample set sounds better. Otherwise, you might want to tune up the volume of the music a bit.
I spot some spacing issues. I guess you are generally using the medium-sized grid for grid snapping. I would suggest you either use a smaller grid size, or totally not using grid snapping. The latter will surely make placing the notes in an organized way much harder and time-consuming, but in my opinion it's a must for making an accurately spaced map. For a quick example,
(Normal)
00:03:754 - the end of slider (2) should be eqaully spaced with (3) like (3)(4)(5)
01:38:754 - (9)(10)(11)(12) should all be equally spaced with each other
etc.
These are all not-so-accurate because of grid snapping... (and FolkFolk has also mentioned this in the above post)
Another point to note is the use of the 1/8 beat at 01:17:941. The first time I heard it I think it's smart to use the 1/8 beat there, but then I doubt that it is necessary. The point I want to bring out is that, at 00:18:504, the sentence "女生穿起吊帶裙" should be of the same beat as "女洗手間太多人" at 01:16:504. If you hear carefully, the "k" sound of "裙" is heard before the first beat of the next bar, but you did not use a 1/8 beat there. My opinion will be, if you insist to use the 1/8 beat at 太多"人", you might as well want to use a 1/8 beat at 吊帶"裙" for consistency, or you might want to give up the use of the 1/8 beat at 太多"人". I don't know, just my opinion, but others might think that it's all OK for the 2 places having 2 different beats.
I hope I made myself clear. If you don't understand what I am talking about, feel free to ask in Cantonese/Chinese/English. 如果我有咩講得唔明即管問啦 XD~