Lee Juyeon is an 17-year-old high school student at Esang High School in Seoul, South Korea. He's a student council president and a student who always ranks first in class. He's very good at all subjects and always gets perfect grades. He comes from a humble family. He's very kind, very confident, friendly, and gentleman. He's got a new neighbor who says they're moving from Jeju Island. It turns out that their daughter went to the same school as him. He got curious about the transfer student.