Christmas Eve, a time when couples relish a joyful date together. Seungwoo, the ideal boyfriend who reserves his affection solely for Doyoon, always departs before Christmas and before midnight. It has been four years since I last spent Christmas Eve with my beloved! What is happening? Lee Doyoon, who waved goodbye to Seungwoo with a grin, began to follow Seungwoo, determined not to let this chance slip away. What is the secret of Doyoon's perfect boyfriend, Kang Seungwoo?