Chaeyoung never once felt happy living a princess' life. Given everything she's ever going to need, somehow, she feels like the pieces of her life are still impossibly out of place. When a mystery brunette gets invited by her bestfriend to her 18th birthday party as plus one, Chaeyoung finds herself oddly comfortable with the stranger's presence. Perhaps, even comfortable enough to agree to run away with her to Paris, where Chaeyoung finds the missing puzzle piece that would finally make the others fall into the right places.