Yuan came back from defeat at the beginning, and Guan Yunchang hung a seal to guess the zodiac.

There is no direct answer to this question, but you can do some reasoning literally.

"Yuan Lai was defeated at the beginning" can be understood as Yuan Shao's defeat in the war and he fled back to Hebei, so the army suffered heavy losses. Judging from the zodiac, "mouse" represents failure in the zodiac. So this sentence may imply that it is the "mouse" that fails.

"Guan Yunchang hangs seal gold" means that Guan Yu left Cao Cao, leaving a thank-you letter (hanging seal) and a box of gold (sealing gold). This story is usually used to represent unfulfilled ambitions or retirement after success. From the zodiac, "tiger" represents courage and independence, which is similar to Guan Yu's behavior of sealing gold.

Therefore, according to the above reasoning, these two idioms may imply that the zodiac is "mouse" and "tiger".