"The chances of us seeing each other as anything more than friends? Zero." After losing her family in an accident as a child, Jeong Yihan grew up under the care of the Han Chio family. But as they got older, the once-familiar bond between her and her neighbor Chio became increasingly awkward. Now, they're suddenly living under the same roof. As their carefully hidden feelings begin to break through, how will their relationship start to change?