According to "Historical Records", Bao Si didn't like to laugh. King Zhou You thought of various ways to make her laugh, but Bao Si never smiled. King Zhou You set up beacon towers and drums. When enemies came, he would light the beacons and call for reinforcements. Once, King You of Zhou lit a beacon fire, and all the princes came with their troops.

When the princes arrived, they found that there were no enemies. Bao Si laughed when she saw the panic of the princes. King Zhou You was very happy and lit the beacon many times. Later, the princes no longer believed it and gradually refused to answer the call.

In the eleventh year of King You of Zhou (771 BC), the State of Shen united with the State of Zhen and the Western Yi Quan Rong to attack King You of Zhou. King You of Zhou lit a beacon to summon the princes for rescue, but the princes did not come to rescue. Quanrong finally killed King You of Zhou under Mount Li, captured Bao Si, and the Western Zhou Dynasty was destroyed.

Extended information:

The protagonist of the story:

King You of Zhou is the son of King Xuan of Zhou, Jijing, and his mother, Queen Jiang, is the daughter of the monarch of Qi. During the reign of King Xuan of Zhou Dynasty, he established his son Ji Gongqian as the crown prince. In the forty-sixth year of King Zhou Xuan (782 BC), Ji Gongyuan's father, King Zhou Xuan, died, and Ji Gongyang succeeded to the throne as King Zhou You.

King You of Zhou was greedy and corrupt, and did not care about political affairs. He appointed Guo Shifu as a minister to be in charge of political affairs. Guo Shi's father was treacherous, obedient, good at flattery, and greedy for wealth, but King You of Zhou used him very seriously, which aroused strong dissatisfaction among the people.

In the eighth year of King You of Zhou (774 BC), King You of Zhou deposed Queen Shen and Prince Ji Yijiu, and established his beloved concubine Bao Si as queen. Bao Si’s son Ji Bofu As the prince, he harmed the prince Ji Yijiu, which made Queen Shen's father Shenhou very angry.

In the eleventh year of King You of Zhou (771 BC), Marquis Shen united with Zan Kingdom and Xiyi Quanrong to attack King You of Zhou, and killed King You of Zhou at the foot of Li Mountain, thus ending the Western Zhou Dynasty. After the death of King Zhou You, the princes and Shen Houyi supported the former crown prince Ji Yijiu to succeed him as King Zhou Ping, which was known as the Eastern Zhou Dynasty in history. ?

Baidu Encyclopedia - Ji Gongyan