Sadly, Hong-gyu has followed is sister's footsteps and is lying to Se-jin. He knows that they their siblings are at odds, but chooses not to tell her. It draws him into this mess when at first he kept himself so cleanly (albeit painfully) away from it. But such is lying, cheating, and deceit. It draws in the innocent and damages everyone it comes in contact with. The writers of "Temptation" understand this well and use it to their advantage, especially when they create characters as spunky, fun, and loveable as Hong-gyu and Se-jin. They are the innocents who are damaged by the greed of others. Even though this isn't a very happy drama and it hasn't always been strong, when it excels, it does it amazingly. The web of relationships is knotted painfully and I don't see any respite in its future.