They say opposites do attract. Perhaps not. Jihoon is an omega who lives in a world where the higher ranks can have everything they want. He lives humbly as an omega should be but despises the distinction that makes him and other omegas look weak and useless. Daniel is the alpha, the heir of the Kang group, one of the wealthiest groups in Korea. He lives his name as Kang; level A student, handsome and fearless, and respected. One day, Daniel's mother brings him the omega to be wedded. He must deny his heart and marry the omega, whose existence is useless and nothing in his eyes. How will Jihoon and Daniel's life be after the marriage? Jihoon, who likes someone else, and Daniel, who must deny the love that he has already given to someone. Together, they are the water and oil, the yin that wishes never to meet the yang, the ground, and the sky. Or is it? Find out the answer in the story.