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A wholesome romantic comedy between a baseball prodigy and a mediocre player! Ever since they first met seven years ago, Youngjun has spent most of his career comparing himself with Hyun, a star baseball prodigy. Youngjun’s own insecurities festered until he doubted Hyun’s kindness and has tried to push him away ever since. Just knowing Hyun has never been anything less than special was enough reason to be jealous. But, all this time, Youngjun hasn’t taken his eyes off Hyun and Hyun has always been there for him. After all, they are the Keystone Romantic Combination.
At 19, Kim Gunho is transported to the 23rd century with enhanced abilities. After spending 50 painful years preventing an apocalypse, he returns to his younger self at 19. Now, with the threat gone and no one aware of his suffering, all he desires is to rest and even wishes to die. It will take 100 days to fully eliminate his enhanced cells. As he prepares to spend his final days in peace, he is unexpectedly visited by Ye Haejung, the boy he secretly loved before his time travel.