It's a good read with a good plot, but somehow it doesn't really shine like other works. The imagery for the dungeons is great and some ideas are really cool but the characters are a bit weak. I think the author made Yiseon bleed and faint a little too much, so it doesn't feel very impactful after a while. On the other hand I really loved how much Hyeon was shocked and anguished at the attempted suicide despite telling himself he didn't care, however I would've liked to see his pov more to understand when his opinion changed from "he's an asset" to "I love him".
I also think that despite being a central part of the plot, we see too little of Yiseon's friends. We know nothing about their personalities or feeling, just that Yiseon misses them.
A Trace of the Wonder