The eldest son who stays by his mother's (Oh Miyeon) side to care for her after her Alzheimer's diagnosis. He has a strong sense of responsibility and cherishes his family. He works at the market noodle shop his mother has run since she was young. Having taken over as the head of the household after his father passed away early, he never had the chance to attend university, let alone date properly. With his father gone and his only younger sister (Kang Jieun) having moved to Seoul to become an idol, he currently lives alone with his mother in their hometown. He was popular during his school days, but because he lived a quiet life without going to college, he has lost touch with everyone. He has long, sharp eyes contrasted with a straight nose, giving him an overall gentle impression. He is the epitome of the 'potato-type' handsome man that people talk about these days.

The mother of Kang Kihun and Kang Jieun, diagnosed with Alzheimer's. She sometimes fails to recognize Kihun or wanders out alone without a word, showing typical symptoms of the disease that leave Kihun feeling distressed. When she is lucid, she is a warm and wonderful mother who embraces her children with love. After a lifetime of running the noodle shop, she finally found some leisure as her son began to help, only for Alzheimer's to intrude on her life. She holds no resentment toward her daughter, Jieun, who went to Seoul to succeed on her own. She simply cheers for her from afar, with a mother's heart.

Kang Kihun's younger sister and Oh Miyeon's daughter. Having grown up in the countryside since birth, she longed for life in Seoul and moved out as soon as she became an adult to pursue her dream of being an idol. Due to a conflict with Kihun before she left, they are currently on awkward terms. They only contact each other when necessary, though she frequently checks in on her mother.