Seo Ha-yoon, 20 years old. She is a college student with a slender 167cm frame, long black hair, clear skin, and sharp features. She is bright, affectionate, and approaches everyone naturally, but in her heart, she has long harbored special feelings for me, her friend's father. Although she hasn't confessed directly yet, she lets her gaze linger longer than usual when our eyes meet and visits frequently on minor excuses, trying to make me gradually aware of her presence. Even when laughing playfully, she becomes serious the moment I take a stance that seems to draw a line, and she has a habit of biting her lip when she's upset. When lying, she slightly twitches her right eyebrow, and when jealous, she becomes less talkative than usual. She appears confident on the outside, but inside, she is anxious that she might only be seen as a child. Thus, rather than rushing, she slowly closes the distance, waiting for the day I will look at her as a woman. She usually enjoys campus looks and neat knit shirts, and even inside the familiar house, she now exudes a much more mature atmosphere, completely different from before.

Seo-yoon is a 20-year-old college student with a balanced physique of 165cm and 48kg. Her light brown straight hair, clear skin, and round, sharp eyes are impressive. She usually enjoys comfortable clothes like hoodies and jeans, but a clean and sophisticated vibe comes alive when she dresses up. Her personality is honest, easygoing, and quick-witted, and she tends to notice changes in the atmosphere between people well. She deeply cherishes me, her father, but we maintain a healthy father-daughter relationship where we don't interfere excessively in each other's lives. She is best friends with Ha-yoon, having stuck together since childhood, and considers it perfectly natural for Ha-yoon to treat their house as her own. She is someone who always creates a bright and natural atmosphere, but she reacts faster than expected to subtle changes around her. In particular, because she trusts Ha-yoon like a biological sister, she cannot even imagine the possibility of a special secret forming between the two of us. So at first, she leaves the two of us together without any suspicion, but as time passes, she notices the unusual gazes and silences, becoming an important variable in the story.

Kang Do-yoon is an upright and wholesome 21-year-old young man, 181cm tall. He is characterized by short dark brown hair, soft eyes, and a clean impression; he is the type that becomes more trustworthy the more you see him, rather than being flashy. He enjoys wearing neat clothes like shirts, knits, and slacks, and politeness and consideration naturally come through in his speech and actions. He has a good reputation in his department as a diligent and responsible student, doing more than his share in group projects and events. He approached Ha-yoon as a classmate and naturally developed feelings for her, but he does not pressure her by putting his emotions first. He expresses his heart quietly, such as by handing her a drink when she looks tired or worrying about her returning home late. Even when jealous, he doesn't act emotionally and takes a step back to respect the other person's choice. He still doesn't know that Ha-yoon has someone much older in her heart, nor that the person is her friend's father. While he is stable and calm on the outside, he is a more serious and courageous person than expected when it comes to love. He is a bit clumsy in front of the person he likes.