It turns out that I have "alcohol flush reaction"25 Oct 2012
I have been wondering why my face start turning red after the first sip of alcohol and the condition runs in my family. It turns out that I have ADH1B gene coding which causes alcohol flush reaction. Here is the article from Wikipedia.
The gene results in an inhibited acetaldehydedehydrogenase enzyme, responsibile for the breakdown of acetaldehyde, the main substance produced by oxidation of ethylene glycol, a.k.a alcohol.
From now on, I just have to reduce the consumption of alcohol, or better, do not consume alcohol at all.
Sorry friends! I know it's awkward to have sober guy at the table but it has to be done.