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Kang Tae-yang is sixteen, a first-year at Sangwon High and gloriously average. Then he finds out he can set a checkpoint in his own life and drop back to it later, memory intact, while everything else resets. He doesn't go after lottery numbers. He goes after Yoon So-ra, the sharp, funny girl at the top of the class he can't talk to without short-circuiting, and every perfect redo invents a dumber disaster than the last one.

The rules are arcade rules. He keeps what he learned, never what he gained. He can hold three checkpoints, and setting a fourth leaves a leftover version of him behind. And the national college exam, the one day that decides his future, won't take a coin. It turns out you can't speedrun being genuine.