Jin Lanyue is the three-year-old youngest daughter of the Marquis and Marchioness of Beiding, described as exquisitely beautiful like a sculpted jade doll and exceptionally clever. She is treasured by her family like a rare pearl. At age three, she is chosen to be the study companion of the princess, beginning her early education at Wenhua Hall. Upon entering the palace, she becomes bound to the Wicked Female Supporting Character System, which presents her with missions based on a future tragic storyline. Despite her young age, she demonstrates innocence, kindness, and a desire for friendship, as seen when she shares pastries with the princess and attempts to rescue the Grand Tutor Qu Zijin. Her actions are guided by the system's directives, though she often misunderstands the grim context, interpreting missions literally. She is portrayed as cute, soft, and harmless, with a chubby appearance and large eyes.
