The first signature is "parting today is like giving wicker (meaning leaving)." This wine is bitter, and there will be no wind, no moon and no you from now on, which means I can't bear to leave and can't accept life without you.
The last signature said, "It has nothing to do with romance. I will write down the preface until you come back." I am writing the preface of this poem here not because of the beautiful romance, but because I am thinking of you, and I am only waiting for you to come back.