forum/bbs and customer service module required

Hi all,

I'm running the shopping cart based on opencart. http://pincoin.co.kr

Majority of my customers are Korean, and they prefer posting an article on the forum(bbs) to sending an email when they have a request, problem or any concern.

I am not sure if there exists the forum/bbs opencart module I'm looking for. Of course, I am ready to purchase it if exists.

My requirements are:

- A guest may leave a private message to shop owner.
- The private message can be read an author or shop owner only.
- A guest author may read his/her posts an replies using the password which he/she entered when posting.
- Owner may post some notices, faq, stickies.

Most forum modules have the private message/topic concept, but it is private for a group.

Is there such an opencart module?