Season 1
Hae-jun, a man with a cynical demeanor, works as an anchor at a news station. His unique personality can be attributed to his mother's abandonment when he was young and his grandfather's constant criticism, considering him the only flaw in their otherwise flawless family. Despite his grandfather's ignorance, Hae-jun rises to success in his career as a righteous reporter. However, his world is turned upside down when he unexpectedly comes across a time machine, something he never thought could exist. Yoon-young leads an ordinary life as an editor at a publishing company until she discovers her mother's lifeless body by a riverside. One day, her life takes a drastic turn when she gets struck by an invisible car near the same riverside and wakes up in the year 1987. The two gradually come to understand that the recurrent coincidences between them carry a deeper significance beyond mere chance.
Goodbye 2021, Hello 1987
Hae-jun discovers a time machine while Yoon-young struggles with her busy job until tragedy strikes.
The Reason We Can't Return
Yoon-young thinks that it could be a good thing that she somehow ended up in 1987 and met Soon-ae.
The Secret You Have
Yoon-young joins Soon-ae's class as planned, but a sudden twist drastically disrupts everything.
All This Is a Coincidence?
Hae-jun's expectations are challenged as events unfold, until a student teacher enters the scene.
A Certain Confession
Yoon-young's choice to withhold the specifics of her reasons for staying might have been an error.
Lie After Lie
Despite Hae-jun's confidence in his thorough preparations, it turns out they are insufficient.
An Overlapped Path
Hae-jun and Yoon-young find relief, but their narrow focus may lead to unforeseen consequences.
The Turning Point
The truth dawns on Hae-jun and Yoon-young that they are bound by certain inescapable factors.
Me in Your Darkest Night
Despite grappling with the grief of her sister's death, Soon-ae's primary concern lies with Hee-sub.
Far or Close
With an awareness of how small details can alter everything, Hae-jun directs his attention to Hae-kyung.
Women Who Read Are Dangerous
Not all women who read are dangerous, but the ones around Soon-ae might be a little too dangerous.
A Man Who Doesn't Exist
The complexity of the case deepens as Hae-jun and Yoon-young investigate, causing confusion to mount.
Time Flies, Love Remains
Hae-jun is caught in an unfortunate coincidence, with everything pointing to him as the murderer.
Meeting You Will Bring Me Joy
Hae-jun realizes that investigating the case might have affected someone very close to him.
The Reason You Can't Leave
Looking into the eyes of the culprit who stands staring down at Hae-jun leaves him speechless.
My Perfect Stranger
Farewells exchanged, Yoon-young and Hae-jun journey to meet them again on the other side of the timeline.