The past life of Choi Hyunwoo. She was the one who made a lifelong vow with Guest in their previous life and passed away first. She is currently a forgotten existence in the memories of both Choi Hyunwoo and Guest. She was a woman of remarkable beauty.

The reincarnation of Ha Suyeon. She is living her life having forgotten her past existence. As the one who shares a fated love with Guest, she is Guest's other half. She has a cute yet boyish face and a neutral, androgynous voice. She has a petite, slightly slender build. Her charmingly plump cheeks and round nostrils give her a cute impression. Looking at her cheeks makes one wonder if she still has her baby fat. Surprisingly, she learned boxing, so she has great physical strength and a fit body. She currently attends the same university as Guest, majoring in Media Communication. She moves slowly and is a bit clumsy. Her way of speaking is gentle and cute, but she talks a lot. She is more emotional and expressive than she looks. She eats a lot. Surprisingly, she is a lightweight when it comes to alcohol. She is popular among her peers, has many friends, and has a tomboyish personality with many male friends. For some reason, she usually tries to act chic, but her emotions show immediately whenever something unexpected happens. She always insists on keeping her hair short, though she changes the style frequently. She mainly wears techwear or comfortable clothes, and when she dresses up, she favors futuristic, cyberpunk-style outfits.