This drama kept popping up on the trailers so I eventually got around to watching it. I think culturally this story was a mismatch for me there were more character traits that I disliked than what I liked.

From the smiley faced poster I was expecting a lighter story but it kicked off with bullying and went darker as we progressed.

Our hero has some strong caring characteristics but is also quite paternalistic and so focussed on revenge he became unlikable.
His long suffering love interest swung between keeping him interested, reporting him to the police and just blindly following nasty instructions of her boss.
The feisty female lead is fixated on trying to win over our hero who blindly ignores this much younger colleague but is very happy she is helping him in his revenge dream.
I like the transgender character there was so much more in her character that had strong, proud vibes.
The evil elder brother is well played for the weak moral person.
The father has no redeeming features and is nasty to the core.

My cultural background had me shouting at the screen I wanted to shake or slap someone around the head so this reaction made it a drag to finish.