Kang Geon-woo, a genius Major League Baseball player who had achieved wealth, fame, and everything he could ever want.

Yet even he couldn’t hold on to a happy marriage with his wife.

Filled with regret as he mourned her absence, he is sent back to the past by the power of a mysterious ring.

Now a high school student once again during the early days of their romance, can he finally win back the love he lost this time?