If you like this drama, please try "Heirs". Its an awesome drama that also has both school life, romance, bullying, family, and that other guy rival, and has hot guys and girls there. It's overall a great drama. Im sure you'll enjoy it. Have a good day.
This drama's main lead is also Lee Min Ho. And this drama is also about a rich boy meeting a girl with charisma and eventually ending up loving her.
This drama is also about a king in modern days who was engaged to a person he didn't like at first but came to love in the end, so if u like Goong I totally recommend the King2Hearts
This drama is about a Half human Half gumiho who wants to become human and its similar to this drama.