Minyoung did not cheat on Cheol. The core conflict in Die in Your Arms stems from extreme possessiveness, past trauma, and a forced separation rather than unfaithfulness. The central issue is that Minyoung outed Cheol to his conservative family during their school years in an extreme effort to isolate Cheol so that he would have to rely entirely on Minyoung. This breach of trust caused a massive trauma and led to a deeply toxic and volatile relationship, which is why Cheol fled and ultimately ended up marrying a woman.
Minyoung did not cheat on Cheol. The core conflict in Die in Your Arms stems from extreme possessiveness, past trauma, and a forced separation rather than unfaithfulness. The central issue is that Minyoung outed Cheol to his conservative family during their school years in an extreme effort to isolate Cheol so that he would have to rely entirely on Minyoung. This breach of trust caused a massive trauma and led to a deeply toxic and volatile relationship, which is why Cheol fled and ultimately ended up marrying a woman.