Ahn Yujin - age 21

An ex-bodyguard that was forced by her cousin to take on one last task of protecting the princess of a small country neighboring Korea. Taking on this mission, she meets a princess who is far from how she imagines her to be. With the princess showing no trust in her she grits her teeth in frustration and continues on with the mission because of her cousin's orders. As time passes, she notices how down to earth the royal person actually is and soon finds herself attracted to the princess. Knowing how it is something that can never happen, will she be able to stop herself from falling in deeper for the princess?

Kim Minjoo - age 23

A newly appointed officer with the ambition to prove she is worthy of her job. With her first assignment being to protect a princess that was set to return back to her country in two weeks, Minjoo gets thrown into a situation where she's forced to take on the role as the princess instead. Suspicions arise as she meets a bodyguard claiming to have been ordered by the princess's royal family to protect her. With no other choice, she is forced to continue her fake identity as a way of protecting the princess. What would happen when she suddenly falls for the person, she is initially suspicious of?

Kim Chaewon - age 24

A teacher who lives on a small island off the coast of Jeju. Returning back to the island after visiting her sister in Seoul one day, she soon meets an injured girl who was stowed away in the back of her truck. As the girl seems to have lost her memory, Chaewon helps nurse the girl back to health and provides the girl a place to stay while she regains her memories. Being a person that was against love all her life, she soon grows an attachment to the new guest of her house. With her heart starting to beat for someone for the first time, will their love be able to happen, especially when the person may turn out to be someone she may not expect?

Honda Hitomi - age 23

An inspired writer who turns out to be a princess that is next in line for the throne after the King's death. Living a normal life all this time without the knowledge of who she actuallyis, an unexpected situation forces her to arrive at an unknown island to be under the care of a straightforward and strict teacher. Not knowing what is actually going on, she lies to the people of the island that she has lost her memory for her own safety. Through the warm atmosphere and nice people of the island, she gets conflicted as she falls in love with the place to the point of wanting to continue living there. It also doesn't help when feelings start to bloom between the clueless princess and the hard-headed teacher. Will she be able to continue her lie forever in order to stay close to the person she suddenly grew an attraction too or will her actual role as a princess force her away from the new place she calls home?

As a princess is ordered to be assassinated, an unintentional swap happens causing four people's lives to go haywired with romantic relationships starting to form. Will Minjoo be able to convince everyone she's actually a princess and will Hitomi be safe from the people that are out to get her, or will their lies be the one to ruin their newly formed love lives?