Hi daseosmyeongok. Welcome to MyDramaList!
To talk about mdl, the site is quite an unique one of its kind imo. It serves as a database for Asian dramas/movies and at the same time a platform to connect with the community. Since, you've already made into the forum, you can check out all the sub-sections. You can create a new post/thread and ask for recommendations or find other people's post.
The feed is another way to communicate with other users. If you haven't checked it already, it's like those social media platforms(Facebook, Twitter). You can post and interact with users, share your thoughts or discuss and definitely ask for recommendations.
You can also become friend with other users who shares the same interest as you(well, not necessarily they'll need to have same taste). The community is very friendly here. So, feel free to ask if you have any questions.
Hope, you have a good time here!