Lee Min Ho's upcoming romantic comedy Heirs is shaping up to be the spiritual successor to the megahit Boys Over Flowers. Returning to the world of privileged young students with the world on a string, Heirs is full of deliciously tricky and twisted relationships, at least according to the details we have so far. How to keep them all straight? We've got you covered. Here's everything we know so far about the casting and interwoven relationships of Heirs.