Kim Haein is famous for her lies

while for Kim Hyungjoon is famous for his dad, which an owner of jewellery empire.

What is their similarities?

Their similarities are they are thieves.

Haein stole Hyungjoon's earrings and manage to escape.

and then, when Hyungjoon escape from his dad's party because he mad at his dad

so he stole his deceased mom's necklace from got sold at that party.

Just when he run from his dad's bodyguard, he stumble upon Haein. He grabbed Haein's hands and run from them.