1. Samsung SM5 used by main character.
2. Daewoo Prince used by main character (and in a fight).

Thanks
When you say "used by main character" you mean 3 or 4 stars? (depends if it is used a lot or not)

1. Samsung SM5 = 4 stars.
2. Daewoo Prince = 4 stars.

Going to add:
3. Daewoo Magnus = 2 stars.
4. Some Korean luxury car in the background = 2 stars (unknown).
From here: http://www.moviereporter.net/fotos/a_bittersweet_life/Bittersweetlife9.jpg

"4. Some Korean luxury car in the background = 2 stars (unknown). "
Hyundai Equus

Thanks