25-year-old Oh Sian (played by JeonYubin) and 25-year-old LeeJunwoo (played by ChoTaeseop) are two individuals who see into each other's deepest pains. What begins as a heart-fluttering connection from opposite sides of a wall soon starts to make their minds and bodies tremble with anticipation. A healing and romantic bond emerges from the collision of two worlds separated only by a wall—will he become the one who guards the long night?
