BJ Alex is about Dong Gyun, a gay man who is a huge fan of a cam boy that goes by the name of "BJ Alex" (clever title reference ik), Dong Gyun shortly finds out that BJ Alex is actually Ahn Jiwon, the student council president of the college that Dong Gyun goes to, and then their relationship goes on from there.
BJ Alex is the manhwa that popularized BLs and yaoi, and for good reason. The character development for both of the main cast is excellent, and the story flows very smoothly with it. It doesn't feel rushed at all, and instead takes it time to tell it's story and characters in a way that's truly refreshing.
I will say that the story definitely felt cliche at first, and does feel boring to people who have already read other BLs, as well as that except for Chanwoo and MD, the other side characters aren't really touched upon in the slightest. But this manhwa definitely had more pros than cons imo.
If you would like to get into yaoi or just BL manhwa in general, BJ Alex is definitely an excellent start.
