In medieval Europe, religious figures considered cards to be the devil's tools. Especially the 13 spades, signifying death, all carry the names of demons. 'Lucifer', the fallen angel who plunged into hell, and 'Beelzebub', the current ruler of hell. Two demons decide to bet everything on a game of chance to settle their differences. 'Jang Tae-young', who captivates hearts with his innate luck, and 'Park Tae-young', who proves himself through intelligence and effort. As close friends since school, they dive into the online casino business and achieve great success. As their success grows, the lucky Jang Tae-young attracts more and more attention, while Park Tae-young's jealousy quietly grows. At the peak of success, jealousy turns into betrayal. Jang Tae-young falls into ruin during a business trip to Vietnam due to Park Tae-young's unexpected betrayal, but he miraculously survives and learns poker from the legendary 'Kwak Dong-wook'. Meanwhile, 'Kaneko', backed by a yakuza organization, becomes interested in the online casino business in Korea and sets up a high-stakes global gambling game involving Japanese and Vietnamese magnates. At the edge of the precipice, the friends with the same name but different destinies, Jang Tae-young and Park Tae-young, finally confront each other there…