[THE VOW] The Vow is the tale of a love that refuses to be forgotten. Tzuyu (Chou Tzuyu) is devastated when a car accident plunges her wife Y/N (Lee Y/N ) into a deep coma. She miraculously recovers - but the last five years of her memories have vanished. Suddenly, Tzuyu finds herself married to a stranger who can't remember anything about her. Naively, Y/N falls back under the influence of her controlling parents (Lee Dong Wook and Yoo In Na) and reconnects with her ex-fiancé (Sana). Desperately, Tzuyu tries to recreate the moments that shaped their romance. Can she rekindle the passion before she loses Y/N forever?