Ok this is just speculation, but maybe the nightmare ties back to the first time her met guwon. Like, when Jinwoo was lying on the ground half alive, guwon came in and hit the intruders over the head in the same fashion as in the nightmare. Also, in the nightmare, when Jinwoo get’s a glimpse of Guwon’s upper half, it’s literally the exact same way he saw him on day one (maybe the author just reused the image, but idk). The only difference is that Jinwoo saw the intruder as his dad in the nightmare.
Ok this is just speculation, but maybe the nightmare ties back to the first time her met guwon. Like, when Jinwoo was lying on the ground half alive, guwon came in and hit the intruders over the head in the same fashion as in the nightmare. Also, in the nightmare, when Jinwoo get’s a glimpse of Guwon’s upper half, it’s literally the exact same way he saw him on day one (maybe the author just reused the image, but idk). The only difference is that Jinwoo saw the intruder as his dad in the nightmare.