Im Nayeon is a literature student who has been living in Kyoto since her childhood. On a stormy night, she sought for shelter in an ancient Japanese shrine, unaware that it would transport her back 500 years in the past. She meets Myoui Mina, a stoic samurai, and together they have to find out how to send Nayeon back to her own time.

Im Nayeon was the center of TWICE, otherwise known as the nation's girl group due how adored they were. Myoui Mina was one of the most popular actresses at the time, after her drama hit internacional fame. Both of them were at the top of their careers, but could meeting each other mean their downfall?

Wedding days are usually synonymous to joy and happiness. But when Im Nayeon finds the love of her life marrying another person, it becomes the exact opposite. Realizing this is her last chance, she has a choice. Speak now or forever hold your peace?