At the young age of 25, Kay set up a travel agency with 2.5 million won in capital and later grew it into BT&I, the country's largest business-specialized global travel group that sells 300 billion won in air tickets, and contributed to the globalization of travel agencies through a partnership with HRG, the world's largest travel group, in 1996.
She is the symbol of the successful start-up entrepreneur of Korean travel experts group, including listing on the KOSDAQ in 2006, acquiring Tour Express and Hotel Trees, the nation's first online travel agency in 2009, and operating SM C&C-BT&I through an investment merger with SM Entertainment Group in 2012. In addition, she has created a variety of domestic first modifiers such as the nation's first MICE travel agency, the nation's first entertainment MICE linking travel with the Korean Wave, and the nation's first travel satisfaction reward system.
In 2016, she served as CEO of the NGO group Holoha, starting with the Happiness Mirror Project to lower the suicide rate by delivering happiness, and served as a director of the Children's Foundation for various social contributions and as a public relations ambassador for Happy People, and paid keen attention to corporate CSR. Kay is currently co-chair of WeShare, private NGO company. Also, in the same year, the current BT&I was established after separating MICE business from SM C&C.
Kay has served as chairman of BeMyConcierge, No.1 VIP Chauffeur service company in Korea, since 2019. In 2020, to enhance the expertise of Meetings & Events services in addition to BT&I's specialties in business travel & incentives, Kay has integrated Chris&Partners, a leading PCO company in Korea, as family brands to extend specialty in Meetings & Events.