"Age is just a number" is a phrase overused by people who enter relationships with a huge age gap. While this is acceptable in some cultures - this kind of age gap is still frowned upon in other cultures.
I say this because viewers need to arm themselves with a good understanding of cultural norms because even though this is a work of fiction, the behaviours portrayed aren't too far from the truth. Without a thorough understanding of culture, viewers will easily question the motives of the characters portrayed in this series.
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The way this kind of relationship was portrayed was well done. I liked how they toned down the bullying and sexual harassment unlike the original which seemed to dwell on the abuse more than anything else.
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Now the elephant in the room - non blood related step siblings. ML's mother married FL's father. I'm not going to detail what the domestic arrangements are because this aspect of the story will be a hit or miss. Others in the comment section are already turned off by this taboo-like situation. I say taboo-like because again there will be cultures out there who will not be bothered by this so I chose to suspend my disbelief so I could enjoy the show at peace.
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Regardless of the situation our main leads had to go through, at its core this is still a perfect example of a noona romance which I wouldn't mind rewatching in the future.