The final farewell from the late great thinker, Lee O-young. This is the last legacy recorded by Professor Lee O-young and the tvN production team, containing the stories he wished to leave behind in 'a world without him' over approximately two years from 2019. Professor Lee O-young left passionate words every day with the hope, "I hope the authenticity of the thoughts I convey at the end will not be damaged and can be helpful to the next generation." These words are captured in an astonishing record of about 2,500 minutes.