So-Ah is a struggling psychiatrist trying to keep her business afloat when she meets Habaek who she thinks is mentally unstable. Habaek, the water god, has come to earth to fulfill a prophecy so he can rule the God world.
So Ah worries about her mental health, unable to dispel the voices from her head. Habaek searches for Moo Ra, whom he keeps spotting on electronic devices.
So Ah is left in disbelief after experiencing Habaek's powers, and Habaek is equally surprised to learn that acquiring the god stones presents an even greater challenge than he thought.
Habaek figures out what happened to the stones and realizes that it will not be so easy to get back to the God Realm or to find the stones. So-Ah finds out the hard way what happens when the Gods use you as a pawn.
In the series finale, Habaek receives information that sours his last few days with So Ah, and the bad news just keeps on coming. Can the couple manage to find a happy ending?