It's from the Romance of the Three Kingdoms (III). The main idea is that I already know who was the first to wake up in a big dream. In spring, I slept enough in a thatched cottage. The sunlight outside the window moved slowly.
is a poem sung by Zhuge Liang after waking up from a nap. This poem depicts the image of Zhuge Liang, who is indifferent to his ambition, quiet and far-reaching.