Ji-woo's want is to become a violinist and perform with popular pianist Jae-yeong. Ji-woo's dream is a man in her dream who helps Ji-woo in the past and tells her to find him. One day, a mysterious being who calls himself a "Mong-sin" appears in front of Ji-woo. Mong-sin suggests a dream deal, saying, "If I sell a dream featuring a man, I will make Jiwoo's dream come true."
'Jung-man', tired of his daily life, comes up with an idea of 'human sandbag' as part-time to make money. From that day on, the tough guy, 'Hwi', and the strongest guy 'Mingyu' teamed up on the road with only one glove in hand. However, escape is quick, neither money nor instinct make them satisfied, and the blood-boiling fighters' thirst is only getting deeper. One day, a mysterious alumni, 'Yoo-young' appeared and made an extraordinary offer to triple their profits, and they secretly got themselves in running a gambling den. The dumb-heads jumped into a fight in the gambling den instead of the streets. The moment the betting begins, there is no turning back!