It's unpredictable but it portrays reality beautifully wherein the wife never blindly follows whatever his husband tells her to do. She follows her own instincts and protects her people but never lets them control her. Every time she saves people using her capabilities as any normal police officer would do.
In fact, the characters are so well defined and rounded like normal people who change based on the situation.The character of male lead as a son of a psychopath is consistent till the end as he doesn't just become a normal happy go-lucky person in the end but keeps repeating the same pattern of why does his wife laugh at some things and not at others. And the acting is outstanding. The little vibrations of his face, mouth and his hands, especially in the scenes where he is emotional or angry is amazing and I don't think I have ever seen someone portray it so realistically.
The plot of the story is well rounded and every time an episode ends, one can feel their heart pounding and not being able to guess even the next scene. Even the previews are properly jumbled so they don't leak any crucial info about the next one.
I loved it and I think this is the reason that kdramas are becoming so.popular. Their writers stand out from others and instead of letting the teenage love story repeat, they try to create something new and different every time.
Simply, loved it!