Seo Ye-seong, winner of the U-18 Baseball World Cup and first overall pick in the draft, was a legendary rookie pitcher. However, after ten years of bouncing between the first and second teams, a series of injuries ultimately forced him to retire. Then one day, he stumbled upon an old glove. Grabbing it transported him back to his rookie days 20 years earlier! Opportunity awaited him. Driven by his desire to play baseball, he embarks on his second rookie season.