What Kdrama is this?

I saw it recommended on TikTok but forgot to write the name down/save the video…

It’s a supernatural thriller where the female lead has the ability to see ghosts or spirits, but there's a catch: she must avoid acknowledging them in any way. If she reacts to their presence—whether by looking at them, showing fear, or making any facial expression—they will stay longer and possibly haunt or scare her.

The ghosts or spirits are often unsettling, appearing with frightening and grotesque faces. To survive, the woman has to stay calm and maintain a stone-faced expression whenever she encounters these spirits.

For example, in one scene, she’s in bed, and a ghost pops up beneath her covers. She has to slowly and carefully put the covers back over it without reacting, so it doesn’t realize that she can see it.