the cold gangster princess is my wife

shes not a typical girl.
shes cold
always has her famous poker face like didn't care of the world
dark aura cover her.

hes the typical boy
he is friendly
always has his famous smile like he dont have problem in the world
carefree man

a total opposite on each other

then one day, they will be engage because of the request of their late grandfathers
will they be create bond on each other ?
or a total opposite happens.