Moonzy

From the very beginning, I struggled with how derogatory his language was toward his student. that immediately put me off. However, it was the ending that I hated the most.
The plot point of his wife sleeping with someone over 30 years younger than her made me incredibly uncomfortable. Even though they are both technically consenting adults, the romantic execution felt entirely wrong. That being said, it doesn't excuse the husband's actions either. He was a terrible partner who remained deeply obsessed with his first love long after marriage, even going as far as to steal competition questions just to fulfill his own selfish wishes. Still, if his wife had truly fallen out of love, she should have left him properly instead of cheating with someone young enough to be her son.
What broke the character dynamics for me completely was the interaction regarding Lee Gang. After everything Lee Gang did to him, I couldn't understand why he was still willing to sit there and listen to another one of his stories; if it were me, I would have punched him and walked away. Furthermore, what he said to his wife about young Lee Gang's story was completely inhumane. Just because a tragic situation isn't entirely "unique" doesn't mean he had any right to dismiss it so callously.
Ultimately, the finale made the entire journey feel meaningless. Instead of building excitement for Season 2, it completely killed any interest I had left..