"Mister X" is a romantic television show based on a social experiment. Thirty girls from different cities and countries compete for the heart of an ordinary guy, thinking he is a millionaire. In the program, the girls go through various challenges and tests to grab the attention of Mister X. However, despite the young man presenting himself as a millionaire, he is actually just an ordinary guy, and the goal of the experiment is to test the sincerity of the girls and their interest in a man not just because of his money. Throughout the show, various situations arise where the girls can demonstrate their honesty, openness, and true love, which is not dependent on the size of their bank account. After a series of trials, Mister X chooses one girl who gets the opportunity to become his girlfriend and continue their relationship off-camera.