Hello gusy! Right now I am working on a chapter when I came across this sentence: "실은 내가 딱 한 잔씩만 먹자고, 삼국지의 도원결의 같은 걸 떠올리면서 고집을 부렸었다." I get to the maining of 'In fact, it was me who insisted on have one drink each', but I am struggling with the part about the three Kingdoms? I feel like I need korean common knowledge for this, which I do not posess. Help is always appreciated!