He knew that in the mornings she buys an Ice Americano at the coffee shop near the publishing house. He knew the way she fixes her hair involuntarily when something bothers her. Knew that every weekend she meets her girlfriends at the same coffee shop in Apgujeong and in the evenings she goes out for little walks before bed. He stalked her, sometimes lurking, sometimes deliberately appearing wherever she was, as if every such encounter was destiny and no other.

Her demeanour, the involuntary smiles that slip in when meeting strangers, the slight wrinkle between her eyebrows as she concentrated on reading... he captured her image on his camera, memorised the names of people in her social circle, overheard scraps of conversation, trying to understand what made her happy, and wrote down everything he learned about this girl as if he were keeping a secret diary of her life. And if something or someone hurt or upset her... Hyunjin made sure it never happened again. Or didn't exist at all anymore.

Without realising that someone was studying her with such persistence, she went on with her everyday life, while he, immersed in his obsession, was losing touch with reality more and more every day...