Lisa's childhood was unhappy; her parents' love was not recognized by their families, and the wife her father married according to family wishes harmed Lisa and her mother after learning about them. Lisa had to evade these dangers with her mother. Fortunately, they later encountered the king of the Duchy of Treadus, and Lisa became a princess of Treadus through her mother's second marriage, where both the king and Prince Karl treated her well. However, Lisa could not forget the past, so she secretly returned to Thailand seeking revenge, disguising herself as an administrative secretary to enter her father's company. There, she met Tipao, who had resigned from the Thai police force to go into business. The two gradually fell in love while working together, but Lisa's identity made their love seem doomed. Domestic rebels wanted to use Lisa and Prince Karl, who were in Thailand, to kidnap them. At a critical moment, Tipao transitioned from being Lisa's supervisor to becoming her personal bodyguard and personally escorted her back home. The king and Prince Karl ultimately quelled the rebellion, but after completing his escort mission, Tipao had to return to Thailand, which made Lisa very unhappy. The king and Prince Karl, seeing her pain, chose to support Lisa in seeking her own happiness. Lisa finally ended up happily together with Tipao.