The fact that Sanho was taken/kidnapped multiple times and he could really do nothing about it just irked me.

Also, it took Sanho forever to forgive Jeyoon for a MISCOMMUNICATION while it only took him a few days to forgive Juwon and Chelho who had been lying to him for years? Please tell me how that makes sense. I understand how there is a difference in the intensity of Sanho's relationship with each of them and a betrayal or a lie by one person can feel a lot more painful than one committed by another, but Sanho refused to even listen to Jeyoon explain what happened. He believed what Pro:s said about Jeyoon and completely disregarded everything that Jeyoon has ever confessed to him, even though that man is clearly not that good of an actor. And then the author resolved all the problems between them, not with a conversation, but by taking the easy way out and having them bond with one another and share memories. The important conversation they did have wasn't shown and instead was only mentioned a few times.

The original conflict in the book was the kidnapping of Guides to use as forced labor. After Sanho escapes, everything seems to have been forgotten though. It's mentioned once immediately after he escapes, but after that, nothing. What about Kim Siho? Is he okay? Did he get to go home? Did the infection spread among the guides in the facility? Was the facility shut down after the virus' research data was discovered? I don't know and neither do you because the author didn't care enough to dig deeper. There was also a great opportunity to create a larger conflict with Pro:s and the virus, but it really felt like an after thought. We only find out that Chelho isn't the kind Ajusshi that he makes himself out to be to Sanho right before he's captured by Jeyoon. The whole conflict between the government and rebel forces would have been a great way to deepen the conflict and expand the story.

I also have a huge problem with the fact that Jeyoon went/almost went berserk 2x because Sanho disappeared. I understand the 1st time he disappeared wasn't his choice, but after waking up, Sanho didn't ask why Jeyoon's waves were so poor when he clearly had access to guiding. He allowed his own anger and selfishness to harm the man he said he loved, in a way that could have actually killed him, not once, but TWICE. It's also super frustrating that Jeyoon just forgives this too. All his anger at Sanho just dissipates when he sees him again after their second separation. Again, the author uses the imprint as a way to avoid having difficult conversations between the MC and ML or having them explore complicated thoughts and emotions.