Waking up from a car accident, Bai Tong realizes that he has been unexpectedly reborn as a 4-year-old. After getting his heart and body played with, in his previous life, he vowed to keep away from playboys in this current lifetime! However... who actually is this playboy? Hazy memories from his previous life, unusual pheromones, and suspects that constantly target him... Can Bai Tong unravel the truth behind his previous life?