Being a police investigator has always been tough work, especially when she classified as a young, beautiful, and cunning one. Though... No case has had her more perplexed than this. Along with her partner; Yang Seungbae, the intelligent bombshell goes undercover in order to find and catch a particular criminal who miraculously leaves behind no traceable clues to his murders. Upon struggling to figure out the killer's identity, she decides to look for solace within a charming young man, eventually letting her guard down as she starts to develop feelings for him. Though, the one thing she doesn't know is that the serial killer she's hunting down is a lot closer to her than she thinks, and is on his way to do the same.

Y/n L/n, a hard working foreign college student, returns to South Korea to find the father of her son, Oh Sangwoo. Once they meet, how does she react when old feelings rise from the ashes of those burnt and left behind? How will Y/n and Sangwoo's relationship change when they discover each other's secrets that have grown in the years they've been apart? Will Y/n still be able to honestly say: "I love you, always."

You had been held captive by Sangwoo and tortured for months while Yoon Bum stayed upstairs. After Oh Sangwoo gets caught and arrested, you're trying to get your life back on track. But things aren't going so well. You can't hold it together at your job. Forming relationships is seemingly impossible. And being alone at night is almost unbearable. Your therapist suggests you try writing letters to your captor in order to get your feelings out-- never sending them of course. But what happens when you decide that you maybe... want to?