She said,
"Fate is nothing but a question which the Deity throws, the answer... is the choices we make..."
He looked at the small figure in front of him and said,
"What you are saying is known as Destiny, because Fate is something… you cannot avoid.”
....
Yoon Su Yeon is a simple-minded, focused, and nerdy girl, living an average life until things suddenly start to change when she meets a doctor who happens to be part of the underworld.

Things started to get more complicated when some mysterious people from her past life started emerging in her present life. They desperately want to change something monumental that happened in the past which left a lasting impact on them. But without any recollection of her past, she doesn't know whether she was even connected to it or not.

If she helps them alter that fateful event, what would happen to her current life?