: Shows a "leaky memory" where she forgets small daily details, prompting her to take photos to document her life .

: Struggles with his hyperthymesia as he vividly remembers Seo-yeon while looking at her best friend who has forgotten her entirely .

In episode 5 of , the central mystery of the leads' connected pasts begins to unravel . Lee Jung-hoon realizes the shocking connection between Yeo Ha-jin and his deceased first love, while Ha-jin faces escalating danger from a mysterious stalker . Key Plot Developments