I'll try to keep my review short and sweet and unspoilery. I watched this drama while airing and genuinely loved it at first, but toward the last third it started to fall apart. It's one of those dramas that you enjoy it while watching, but after the episode finishes and you think it all over, you're left with too many questions. Each of the abandoned little plot threads and inconsistencies might be minor and ignorable alone, but when you add it all up, it makes the story feel flimsy. The chemistry between the lead couple never really convinced me, I felt very much as if I was being told "they're star-crossed lovers!" without being organically shown. Multiple aspects of the last episode were confusing and upsetting, or felt forced and slapdash. The star of this drama is Kim Bum as Lee Rang, the misguided, damaged, emotionally tormented younger brother - it was an absolutely fantastic performance, and far more compelling than the actual lead. Lee Rang is a character I'll never forget.