In the early 1980s, Pittsburgh's Rizer Sharp (Sylvester Stallone) and Kid MacDonald (Robert DeNiro) staged two classic boxing matches that captivated the world. But shortly after the 1984 match, Rizer, who was at the peak of his career, suddenly announced his retirement and quickly spent all his property, becoming an ordinary worker who sold his labor for a living. In contrast, Kidd continued to decline, endorsing various inferior advertisements and spending his time by talking. One day in 2014, Dante (Mason Mackie), the son of Rizer's agent at the time, came to him and invited him to participate in the production of a certain game. Unexpectedly, at the production site, Rizer and Kidd, who came uninvited, fought each other. The video of the two fighting went viral on the Internet, and their 30th anniversary battle was put back on the agenda. However, the two of them have long passed their peak. Can they cope with the erosion of time, put aside their grudges, and complete this belated duel...