The story of playing the pig to eat the tiger often appeared in anime and novels. The female protagonist had a strong background but was very beautiful. She often played the role of the villain by hiding her strength and gradually showing her strong strength to finally defeat the protagonist. This type of story was very popular among readers. Here are a few representative anime and novels: In the movie " Ghost Blade ", the mother of Tanjiro was once a powerful ninja. In order to protect her son, she gave up everything she had. In the end, she pretended to be a pig to eat a tiger and displayed her powerful strength to defeat the ghosts. 2. In the Index of Forbidden Magic Books, the mother of Shangjo Dangma was a powerful mage who hid her true identity in order to protect her son and defeated the enemy through a series of means. 3. Kirito's mother in the Sword God Realm was a powerful game player. In order to protect her son, she hid her true identity and played the pig to eat the tiger. Through a series of means, she finally became the game administrator and controlled the entire game world. The heroine of the movie, Gerela Shapek, was a powerful scientist with the ability to predict the future. She was once a decent character, but in the battle with the villain, Bertot Hubert, she exposed her true identity in order to protect her friend. She played the pig to eat the tiger and showed her great strength.