The East Kingdom's princess was known to die in a very tragic way. But it was still unknown and controversial until now. No one knew who she got married to, or how she died. That was what made Yoon Yeonseo interested in her story. Things started to change when she accidentally travelled back time to 300 years ago, the year of King Sunoo's reign. Now it was her chance to find out what actually happened to the princess. From how she got married and whom she married, to how she died and why she died. To her surprise, there was suddenly an unknown man in the princess's life. There was no history about the man and his contributions to the kingdom. But suddenly, he had her heart and she was starting to dread to come back to the present time. And that man was the nobleman, Yang Jungwon.

- THE UNEXPECTED SERIES : BOOK I - Devastated by the sudden confession from her boyfriend, Park Edlyn decided to go to the rooftop to clear her mind. That is until she met Sim Jake, a handsome neurosurgeon who worked at her father's hospital. They both decided to get drunk and tell each other life stories. It was going so well until they both woke up sober in the same hotel room with marriage documents on the table. They realised they got married due to a drunken mistake but both of their families didn't want them to get an annulment because it would ruin their reputation. Can Edlyn and Jake live together without having the urge to kill each other?