If the husband has a zodiac sign on his head, is his poem also a poem composed by Han Chan?

No. It's in the preface of the poem.

Lu Yun, a scholar from Taikang, said in his "Preface to Hancicada's Ode": "If a husband has a crotch on his head, his writing will be clear; if he drinks dew with Qi, his writing will be pure; if he does not enjoy millet and millet, his writing will be clear." He is honest; he is frugal if he does not live in a nest; he is trustworthy when he obeys his lord; he is trustworthy when he adds a crown to his appearance; if he can serve the king and establish himself, he is not the most virtuous insect. "This paragraph of text greatly praises the excellent moral character of cicada, which can be summarized into the five virtues of "literacy", "purity", "honesty", "thrift" and "faithfulness". It can be used as the embodiment of the ideal personality of a scholar and represents the personality embodied in the image of cicada. Pursue.

The above is for reference, hope to adopt it~