Youngjun's whole life has been about comparing himself with the "baseball genius," Hyun. Ever since Hyun set the standards for Youngjun's baseball life seven years ago, Youngjun has had plenty of reason to resent him. But now, for some reason Hyun has become the curveball Youngjun simply can't take his eyes off of... A wholesome romantic comedy between the genius player and the baseball amateur begins with the Keystone Romantic Combo!