A crystal meth dealer with a tragic past is forced to team up with a renegade cop to take down a powerful crime lord.

This biopic tells the true story of Korean boxer Kim Deuk-gu. Born into poverty, Kim used boxing to free himself from his bleak surroundings, eventually becoming the world's top lightweight. Tragically, Kim's life was cut short when he died from a blood clot in his brain during a championship fight with Ray Boom Boom Mancini.

Tae-joo manages to rise in rank in a gang for saving the boss's life. However, prosecutor Dong-pal appears in front of him as his sworn enemy. Meanwhile, Jo-pil wants to get rid of Tae-joo's gang, training for revenge. The three men's goals intertwine.

Hochang accidentally sees missionaries and Jeongrim play baseball at the YMCA hall. He falls in love with Jeongrim, and takes interest in baseball. As a result, he gathers people to form the first YMCA baseball team of Joseon.

A middle-aged gangster's lifetime of mistakes catch up with him as his personal and professional life is destroyed.