May 2019                        Selection of preliminary start-up package.

May 2019                        Establishment of YH Tech

March 2020                    Admission to the Youth Entrepreneurship Academy(SMEs and Startups Agency)

March 2020                    Development of Airshield freshness retainer

October 2020                 Moved in to Chungnam Technopark Bio center

November 2020             Solidification of Airshield freshness retainer and completion of the prototype.

March 2021                    Selection of additional courses for Youth Entrepreneurship Academy