Some lower-priced products give a finish close to a luxury one. Below are three luxury lip products, each next to a cheaper product with a similar finish, with store prices. We compare finish and price; we do not test products.
Lip Product Dupes
LUXURY

Chanel Rouge Allure Velvet
$35
K-BEAUTY DUPE

MAC Retro Matte Lipstick
$21
Similar matte finish and wear. MAC has more shades that suit Korean personal color seasons.
LUXURY
YSL Rouge Volupte Shine
K-BEAUTY DUPE
Romand Juicy Lasting Tint
$7
Romand's glossy tint gives a similar dewy finish at about 1/4 the price.
LUXURY

Dior Addict Lip Glow
$36
K-BEAUTY DUPE

FWEE Glassy Lip
$16
FWEE's balm-like formula gives a similar sheer, natural color.
Summary
A dupe is not always a copy. Some use similar ingredients; others only look similar once applied. The Korean beauty market is crowded, which keeps prices low. Compare the ingredient lists before you buy.