Your Highness, Your Hidden Guard Is a Bit Silly - Season 1 (110 episodes) - AllShorts

Yinyin, the top assassin of the Black Feather organization, possesses peerless martial arts but is forced to be "laid off" after exhausting the organization's budget. In order to earn silver to rebuild the organization, through a twist of fate, she becomes the personal hidden guard of the tsundere Third Prince. This naive assassin has a bizarre thought process; her strange logic and weird justifications leave people bewildered, yet she is adorably blunt and dead serious. The tsundere prince's blood pressure soars from her antics, leaving him with mixed feelings of love and exasperation. Thus begins their hilarious daily life as a bickering couple.

Your Highness, Your Hidden Guard Is a Bit Silly - Season 1 - 1