If there was any big plot holes or things that did not make sense it was Senior Mr. and Mrs. Hong, what did Chairman Hong really gain from supporting the family that murdered his son (if it was all about money/power this did not come across well) and worst is Mrs Hong this woman had no redeeming qualities yet they tried to gaslight us into thinking noooooo she does love her daughter, lets call FUBAR on this.
Paik Sa Eon is an excellently written character, everything he did/said was in line with the psychology of this character that was well developed and presented with nuance. The final action of fleeing does make sense if you understood his trauma. YYS gets full marks on his performance.
Hong Hee Joo had a tough challenge to hold her own against a very charismatic ML and give full credit to CSB for able to portray HHJ with silent strength. She was not just a romantic tool, or a mere plot device, she was her own interesting person and her character had a fully evolving journey in the plot.
Final acknowledgement of excellence to the entire production team director/editor/writer, especially the screen writer for this superior adaptation.