Delicious Delivery/美味速递/맛있는 택배

It is an R-rated movie about a delivery boy's sexual life with some desiring ladies and finally found his true love. This must be a fantasy of some young guy(s).

I have to say that the actors/actresses are not so good-looking as other R-rated movies in South Korea. I can understand the conditions of supporting roles, but why the leading girl was normal-looking too? The producer could not afford some pretty girls?