Probably because of MC (cheated behind Honam's back) and ML having an affair while he's still in a relationship. This story will be okay-ish if author didn't add that.
Also that fact kind of ruined the vibe for me, too. I don't tolerate cheaters even in fictional characters cuz why authors and other readers tolerate it? Then be like oohh they're so cute and just basically ignore the fact that they're cheating at the start whatsoever.
And as someone who grew up seeing my mom and so many of the wives in my family get cheated on, it’s hard for me to just brush that kind of behavior aside, even in fiction. Maybe other readers can separate it from reality, but for me it hits too close to home. So when a story tries to romanticize cheating or act like it’s no big deal just because the couple has chemistry, it completely ruins the romance for me.
Rather than focusing on "cheating" which is highly debatable after being neglected and left alone without a word for MONTHS... I think allowing some thought into how it feels to be ghosted and left alone by the one you love without an end date. He had no way to contact him and therefore no way to end their relationship. Everyone is quick to judge him for finding what little joy he could (also he didn't... he felt guilty the entire time) and someone that helped him not feel so alone and pushed aside rather than Honam who literally left his lover with a sticky note and nothing else. To me, that ended their relationship and he never cheated on him in the first place. I digress because opinions differ, but lowly rating a story based on that alone and not actual story development is not cool. If you don't like it, don't read it but I don't agree with giving low ratings for that - I'll just move on if it isn't my cup of tea.
While the story was frustrating at times, it did resolve all of the issues by the end. Honestly less angst than a lot of bl stories. They are cute, the chibis are cute, the problems are resolved well. Overall very cute read.