Season 1

Jung In drafts an article at her DBS office as usual, but she suddenly wakes at the desk of an unfamiliar office. Returning to DBS, she finds colleagues behaving strangely and insisting she no longer works there. She soon learns that her father, Seo Ki Tae, is dead, a revelation that unsettles her because she had just celebrated his birthday with him. A year later, she receives a phone call from Jin Woo, who lives in 2015.