The landlord said that "the fog clears and the empty cup is a Millennium dream"? It should be "empty pillow Millennium dream"
Literally, it means "gone, the past is gone." In retrospect, everything in my heart is just a dream. "
This kind of feeling is often expressing the sigh of nothing in the past, or expressing that what you think is just wishful thinking, but actually just resting with a pillow and dreaming big dreams, which is not true and has no income.
What we often call "absurd dreams".