Perfect Crown

It is set in the 21st-century constitutional monarchy of the Republic of Korea. It is a romance that breaks down status between a woman who has everything but is a 'commoner' and a man who is sad because he is the son of a king but cannot have anything.
Seong Hui Ju is the second daughter of a conglomerate family ranked number one in the financial world. She was born with a silver spoon and has gorgeous looks, intelligence, and a fierce competitive spirit. The commoner status, which she thought was nothing special, becomes an obstacle in her life, and she becomes entangled with Prince Lee An.
Prince Lee An is from the 21st-century constitutional monarchy of the Republic of Korea. Born as the king's second son, he is destined to have nothing but his status as royalty, and his change begins when he meets Seong Hui Ju.
(source : mydramalist)