Prologue: The Begining of a Lie

Royal guard Kim Jungeun is forced to live as a man. Princess Kim Jiwoo is forced to deal with the consequences.

or

Jungeun's father wants a son so desperately that he pretends Jungeun is one. Amidst all these, she falls in love with Princess Kim Jiwoo. The worst and best of all, the princess might love her back just a little.

not an original story!!! it is a converted story - all credits go to the original author