I have been wanting to watch this particular Korean drama ever since news of it first broke out. I wasn't able to get on Boys Over Flowers (a similar drama) so I'm glad I enjoyed this one thoroughly. The story is similar in many ways like Boys Over Flowers and vastly different too.
We have a bunch of rich kids that have all arranged themselves in a strict hierarchy, a girl who is an heir to "poverty" and elder characters who have their own hierarchical issues to deal with. The difference is that, while the main male character in BoF is an ice king turned gentleman, The Heirs' Kim Tan is first presented as a mild-tempered exiled second-son. There may be more to his character than what has been presented in the first six episodes though. Coincidentally, both main male characters in BoF and The Heirs is played by one actor, Lee Minho.
Performance-wise, Park Shinye and Lee Minho have chemistry so that enables them to act more fluidly. I can't really tell with the others yet, since I think six episodes (and this is the first time I've seen them all act) is tad too short to make a comment about their acting and characterization. The music used is very good too! I'm enjoying Lee Hongki's Love Is... a lot. I hope they release a full OST soon!
Six episodes in and I can't wait for more!

