The adults act like childish while the teenagers get all the emotional heavy stakes and interesting plot developments.

The best parts of the drama were actually the teenagers and their struggle to meet these physically and mentally taxing educational standards and expectations of their parents and society as well as the mother daughter relationship between the aunt and niece. The wildness of the the hagwon institutions like how the parents have to line up everyday to get the best seating for their children was interesting as well. The murder mystery part of the drama was okay, but it was dragged on for like 3 or 4 episodes too long. When it was revealed that the brother is a red herring and assistant guy is the murderer, that's when they should have wrapped it up.

I quite enjoy seeing pairings where both grown consenting adult characters have the female lead as older than the male lead and the corresponding actors, but the casting here is really distractingly off with the actress not looking anywhere near believable as the character age range she is portraying. It didn't really need to be a noticeable issue except for the drama itself making it awkward by throwing lines like "she doesn't look old enough to be a mom to a teenager" and showing that only a decade has elapsed between the past and the present the story takes place in. It's compounded by the fact that the costume department didn't make a single effort to at least style her to look like she's in her 30s or even 40s and always put her in clothes and hair styling that made her look very middle aged.

Her character is also like an emotionally volatile doormat, it would have been nice to see her have some smarts and effectively save or stand up for herself and her loved ones from time to time. Her version of acting cute was really off putting as well with the over the top laughing as she covers her face and violently hits whoever is in front of her. The romance plots of all of the adults were the least interesting parts of the story. None of them had chemistry and it would have been better to keep those as brief as possible. The teenagers were more interesting, I like how the two boys actually developed a friendship despite being love rivals.

For a single mom with younger man romance that also includes a serial killer plot, I recommend watching When the Camellia Blooms instead of this drama.