Let me explain how this works - you'll need a dots projector and video camera since goryos are quite particular about how they show themselves (this is actually because they're one of the shyest ghost types).

The first thing you'll want to do is get your equipment set up in what you believe is the ghost room, and here's the interesting part - you absolutely need to watch through cameras because goryos won't show their dots signal to the naked eye. Place your dots projector somewhere with good coverage, and make sure you've got a camera watching it (using higher tier dots gives you better chances, by the way).

Now comes the crucial bit - everyone needs to leave the room completely, because these spirits won't show themselves if anyone's physically present. You can watch from the van or another room through your camera feed, and that's when you might catch their silhouette moving through the dots grid. Something worth knowing - they tend to stay pretty close to their favorite room, so once you've found where they're hanging out, you won't need to move your equipment much.

Just remember, if you're struggling to see anything, night vision on your camera can make a huge difference, and removing other interactive items from the room can help encourage dots activity. When you do see something, make absolutely sure nobody can see it with their naked eyes - that's your confirmation right there, since goryos are the only ghosts that exclusively show dots through cameras.