Gentle Intruder

"The probability that we'll see each other as romantic interests? Absolutely zero." Jung Yi-han, who lost her family in an accident during childhood and grew up under the care of the Hanchio family. As she grew older, the awkwardness only accumulated, and now she begins living together with her neighbor oppa (older brother figure)... How will their relationship change as they keep intruding into each other's carefully hidden hearts?