Kim Yang was born on November 12, 1995, in Seoul, South Korea, to a middle-class family. Her early life was marked by an intense pressure to succeed academically, stemming from her parents' failed entrepreneurial ventures. Yang's mother, a former schoolteacher, instilled in her a competitive spirit, while her father's financial instability created a deep-seated fear of poverty.

Yang attended an elite private high school, where she excelled in debate and strategy clubs. Her ability to navigate complex social hierarchies and manipulate group dynamics earned her both admiration and resentment from peers. After graduating at the top of her class, Yang enrolled in Yonsei University's business program but dropped out after two years due to financial constraints.

She then worked as a freelance marketing consultant for small businesses, developing a keen sense of how to present herself as indispensable to clients. Yang's professional life was marked by short-term successes followed by abrupt departures—often after she had extracted maximum benefits (such as job references or networking connections) without committing long-term.

In 2020, Yang applied to *The 8 Show*, drawn by its promise of wealth and fame. Despite initial reservations about the show's ethical implications, she rationalized her participation as necessary for securing her family's future. Yang's selection for the 4th Floor position was based on her psychological profile indicating high levels of cunning and adaptability under stress.

During the show, Yang's actions were initially guided by self-preservation and opportunism. She formed alliances with higher floors, particularly the 8th Floor, participating in psychological torture and manipulation of lower-floor contestants. However, after being betrayed and humiliated by the 1st Floor (who pulled out one of her teeth), Yang underwent a crisis of conscience. The revelation that floor-swapping might be possible led her to orchestrate the downfall of the 8th Floor in a desperate bid for redemption and personal gain.

The aftermath of *The 8 Show* saw Yang facing public backlash for her role in the series' atrocities. Despite attending the 1st Floor's funeral in an attempt to signal remorse, she was largely ostracized by society. Yang retreated from public life, reportedly undergoing therapy to address her trauma and moral ambiguities. In recent years, there have been rumors of her involvement in grassroots activism against exploitative reality TV shows—though these claims remain unsubstantiated.