A big budget, beautiful actors and sceneries, and nice cars could not propel this KDrama to the level of others that share the same tropes. It's not all bad, but there were so many wasted opportunities for this to be spicy.
Characters: FL-dull and lifeless; ML- I liked, but I was sneak dissing him by the end. Other characters- awesome opportunities to explore how they could have pushed the plot, but didn't.
Unnecessary parents- did not impact or improve anything.
Avenge your brother-period. Nope. Let's "change the school's culture". Unrealistic outcomes based on a lackluster plot and mediocre acting.
Romance? Let's race to see if we stay together (Boys over Flowers vibes). They tried to have a triangle, but that failed.
The "blackmail" idea became tiresome by the end. This could have been so awesome with some twists.
The biggest letdown, IMO, were the underdeveloped relationships, irrelevant flashbacks, and overall failure to launch (all over the place).
Watch it. Grapple through all 7 episodes. At the end, I think there's an aftertaste that needs a spoonful of sugar.