Praomook follows the complicated relationship between Praomook and Chalunthorn, childhood acquaintances who are unexpectedly forced into an arranged marriage.
After a series of unfortunate events convinces Chalunthorn's family that he is cursed with bad luck, his parents insist that he marry Praomook to help reverse his misfortune. However, Chalunthorn wants nothing to do with the arrangement. Having long viewed Praomook as an annoyance, he goes to great lengths to drive her away—including pretending to be in a relationship with his best friend.
Praomook, meanwhile, agrees to the marriage for her own reasons. Still hurt by years of mistreatment and heartbreak, she decides to make Chalunthorn fall in love with her so she can ultimately break his heart in return. As old wounds resurface and new romantic rivals appear, the two become caught in a battle of pride, revenge, and unexpected feelings.
What begins as a marriage built on obligation gradually develops into a passionate enemies-to-lovers romance where both must decide whether to continue their games or finally listen to their hearts.