Error of Statistics - S1.E4

The statistics report Dong-jin wrote returns to him after his mother's death, and a battle within himself begins. He takes time off work and finds a place to live next to Mi-jung to get closer. Meanwhile, a victim of Dong-jin's work comes to get his vengeance, which makes him realize numbers aren't the answers to everything. Afterward, he returns to his hometown to find clues that will break Mi-jung's witch's curse.