Stop in for a cup of coffee

So, yesterday I went out and rode the subway to Iteawon. Was a warm day here 55 deg. Walked around a bit . Stopped to smoke and found some white guys. One spoke good english. They are from Turkey, and live outside the city, working in chemical factories. They offered me some Soju and we bs'd for a while, watching the women go by. Had a fun time. They were pretty cool.
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What is Soju?