Byun Baekhyun a son of a famous businessman who happened to be one of the most powerful mafia lords in South Korea, known as the Golden Serpent in the underworld because of his greediness of power and wealth. Baekhyun's father is the mortal enemy of the Trinity. Golden Serpent's greediness has led him to sold his son to his fellow business partners in a high price, he wants to be in the top of the food chain, he wants more money, more power. Park Chan, Yeol and Loey, the billionaire triplets, the mafia kings. The three of them are the most feared kings in the underworld and in the world of business, they are known in the underworld as the Trinity. They became the most successful of all businessmen and mafia lords in Korea. The three of them are so closed towards each other, they cared and loved each other just like other siblings would do, they are inseparable, it's their key to their success. But what would happen if they cross their path and the triplets will fall in love in Baekhyun? Would the triplets will still be inseparable? Who would Baekhyun gonna choose?