At 38, Su Mu hits rock bottom after his marriage falls apart and unexpectedly activates the "Youthful Recklessness System." Abandoning his former listless and spineless ways, he uses his own unconventional methods to help his son overcome an emotional crisis and mend years of estrangement with his daughter. After unexpectedly crossing paths at work with a female CEO who has secretly loved him for years, he turns his life around, undergoes a remarkable transformation, and embarks on an entirely new and fulfilling chapter of life.