Zi Jin is a poem in The Book of Songs, the first collection of poems in ancient China. This poem describes a woman who misses her sweetheart. They met on the rostrum, but they couldn't wait long. The woman is eager to see, complaining that her lover doesn't come to the appointment, and even more blaming him for not sending a message, so she sings the infinite emotion of "not seeing for a day, like March".
This poem consists of three chapters, each with four sentences. It fully describes the psychological activities of female lovesickness in flashback, which is vivid and beautiful. This is a rare and beautiful love song, which has become a classic in the literary history of China.