You

Its about Krystal and kai.
They both we're married but kai hate Krystal.

Because he think that Krystal are the reason why his sister death.

And he going to make her suffer for the rest of her life.

But,
He didn't know that Krystal are The princess of Jung's.
Jung's are the richest family in the world.
They are gangster but they have other works then gangster. Sometimes can be good to other people.
They only be bad if somebody we're make something bad to their family or their workers.

But what if kai make Krystal suffer ????
What will her brothers do???