It’s Christmas eve and Ju-hyeon has no one to spend it with. Her own daughter is too cool to spend it with her mom and so is everybody else at the police precinct Ju-hyeon works at. Right when Ju-hyeon is ready to throw herself a pity party, Santa brings her an early Christmas present: Choi Si-Woo A.K.A one of her daughter’s friends. But what started out as an innocent invite to share cake at her house soon turns into a hot steamy night. Come morning, Ju-hyeon wants nothing to do with Si-Woo but… Two things are for certain: Si-Woo is not going to let Ju-hyeon push him away and Ju-hyeon is definitely ending up on the Naughty List next year!