The drama is about a retired idol and a ordinary living boy who shifts upstairs in a home sharing. As the male lead helps the female lead when she is sick, there's the story starts giving butterflies. The female lead is unstable in both life and career but the male lead this hard and maintains his ethics so it was no way that he would've called for such person but, he did in spite of having a long one-sided love.
In the course of time, the drama portraits sadness and the story ends with disappointments in viewers eyes by choosing realistic ending.
P. S : There are wonderful kiss scenes and lots butterflies.
Hope you add in your list.