1. "Dooneun" is a free font. Everything except selling it is possible.
It is provided free of charge for commercial use to all users, including individual and corporate users, and you are free to use it.
(It can be used freely in various media such as video media, print media, web, and mobile.)
2. However, users may not modify/transform the font and redistribute/sell it.
3. If you have an image of a printed material or advertisement (including online) that uses "Dooneun", I would be happy to show it off.