When the virtual reality game Tower of Trials was released, it gained the attention of dedicated players due to its extreme difficulty. However, its reputation quickly fell after people realized they could not complete the game. Nonetheless, following 11 years of trial and error, content creator Kang Jinhyeok becomes the first to finally beat Tower of Trials.

As Jinhyeok plans to quit his passion for a more stable income, he is in for a surprise—Tower of Trials has appeared in the real world! Moreover, a notification announces that players must clear all the Tower's floors within 90 days or the whole of humanity will perish. To Jinhyeok's advantage, the manifested building replicates its game version that he has just defeated. With his vast knowledge of the Tower, Jinhyeok decides to conquer it once more to save mankind from certain doom.