Woo-Ri Nam has always been the golden boy—wealthy, carefree, and untouchably lucky. But on the leap day of 2028, his 7th real birthday, everything changes. A seemingly harmless reunion with an old classmate, Su-Bin Shin, ends in a brutal murder. And then, inexplicably, Woo-Ri wakes up back in high school, right beside Su-Bin who has no idea that he...