Set against the backdrop of the shipbuilding industry in Ulsan, South Korea, during a time of intense industrial growth, 'May Queen' follows the turbulent lives of ambitious young people. The story centers on Chun Hae-joo, a bright and resilient young woman who overcomes a harsh upbringing and family secrets to become a pioneer in the marine technology sector. As she uncovers the truth about her birth and the corporate corruption that ruined her adoptive family, she becomes entangled in a web of romance, ambition, and fierce corporate rivalry involving Kang San, Park Chang-hee, and the calculating Jang Do-hyun.