The story of a man who brings good luck and those who get carried away. Jung WonHo, an office worker who spent a normal day, accidentally saves Ji TaeWoo from a car accident. WonHo is attracted to TaeWoo, who saw the accident as a chance to approach him, and now the two are getting closer...

Bae Songwoo is in a one-sided love with his longtime friend, Kim Sangjin. Living his life hiding his feelings, one day Bae Songwoo finds a suspicious book in his house, and written inside is Kim Sangjin's life story.
But Bae Songwoo is just a passing extra...?!
As he tries to ignore the book, Bae Songwoo soon realises that everything is going as written...