I usually never write reviews. Guess this is the first time. Guys, just go ahead and watch. It's one of the best dramas i ever watched. I really wish for a season 2. Sung soo ji as an adult. It will be a hit. Just a high schooler with her wits, guts and help from friends cleaned an entire school. She is really one of the best character. I admire her. Not like she's perfect. But she is strong, brave, dare to think, dare to do anything she can to solve the issue. She didn't just stay the same as she is in the first episode, she evolved, improved and got better. This teaches you a lot. The concept is just mind blowing. A pyramid.. You know the one who is in the bottom can be the one who gets to new heights as long you are brave enough to face everything. Just great. Ost is also good. Higher ??.