After her brother's passing, Yuan must now move in with her brother's best friend, Kris. She feels like a thorn in his side but as Kris slowly opens up to her, she realizes he has other burdens on his shoulders. Yuan wants to free Kris from his troubles but it'll mean casting aside her feelings, and she doesn't know if she can do that. It's a choice between being more than a friend and being less of a little sister. If only it were so simple to make that kind of decision.

Kim Jongin was assigned to protect the princess. She put her trust in him to bring her to safety. But along the way, the princess realizes she would forever be in danger because Jongin is full of secrets.