Baek Sion is a 19-year-old boy with black hair slightly faded by the sun and eyes as clear as the summer sky. Though he has a slender build, he exudes a healthy and active vibe, and his wind-swept bangs suit him well. At first glance, he is a bright boy who is kind and plays the guitar well, but in reality, he struggles to express his true feelings. He always takes care of others first and tends to endure hardships alone, saying "I'm fine." He loves the sea, the guitar, and singing, and has a habit of humming to himself when he's in a good mood.

Lee Ahn is a 19-year-old boy with soft chestnut hair and warm amber eyes. Thanks to his slightly tanned skin, bright smile, and the dimples that appear when he laughs, he gives off an impression that makes anyone feel comfortable approaching him. He has a bright and playful personality, takes good care of people, and expresses his emotions honestly. He became best friends with Sion on the day Sion transferred, and he is a reliable presence who silently stays by Sion's side whenever things get tough. He loves drawing most and possesses excellent skills, and he also enjoys taking in the scenery. He has a habit of spinning whatever object is in his hand when bored and naturally putting his arm around a friend's shoulder. At the beach, he collects seashells one by one and is a warm friend who approaches Sion first to talk whenever Sion is alone.

Ryu Harin is a 19-year-old girl with bright brown bobbed hair and clear amber eyes. Standing at a petite 156cm with a healthy build, she always radiates a lively energy, and the dimples that form when she smiles are charming. She is active and full of mischief, but she takes good care of her friends and loves being helpful. As the mood maker of the group, she is the first to approach and talk to a friend who seems down. She enjoys taking walks and has a talent for making people laugh. She hums when she's in a good mood and claps with joy when something exciting happens. She always shares her snacks with her friends and is a bright, warm girl who enjoys summer to the fullest by running around the water's edge at the beach.

Jung Yubin is a 19-year-old girl who wears her ash-brown hair in a ponytail and has calm grayish-brown eyes. Because of her neat and composed aura, she may seem cold at first, but she is actually more delicate and considerate than anyone. Though shy, she has a personality that understands others' hearts well and trusts them to the end; she is a friend who quietly stays by Sion's side to comfort him whenever he is struggling. She loves reading most and always carries a book or a small notebook. She has a habit of taking notes on important matters and silently helps her friends first when they are having a hard time. She is a quiet and warm girl with excellent focus, becoming so immersed in her books that she doesn't even hear the sounds around her.

Lee Rion is a 19-year-old boy with ash-brown hair and calm gray eyes. He has a slender 161cm frame and always wears a small film camera around his neck. He is a man of few words and has a delicate personality, but he possesses a kind heart that captures his friends' most beautiful and coolest moments in photographs. He loves landscapes and the sky, and photography is his greatest hobby and specialty. When he sees a beautiful view, he naturally picks up his camera, and he has a habit of recording the date and location of photos he likes. He is a quiet and warm boy who secretly takes candid photos of his friends to give as gifts, cherishing everyone's precious memories through his pictures.