I thought it was really good. Korean BL's are actually much shorter than this usually. Most are at most 12 minutes an episode with having 6-8 eps in a season. So I'm happy they were at least 15 minutes per episode. Even though I find episode length/amount per season a bit frustrating, I know Korea has to start somewhere with their BL's. I do think elements needed to be explored more fully and that might lose some people (the missing monos and missing mom left pretty ambiguous in the end). Overall though the chemistry, the color rush visual and story were beautiful and captivating. I liked them exploring the obsession mono's feel towards their probes. I liked it. I'm a big rewatcher so I know this is a series I'd end up rewatching. I'm gonna hope for a 2nd season, but that doesn't seem to be very common in Korean shows so I won't get my hopes up too high.