There has been many many great reviews of the story, so I will add only one that I have not seen anyone mentioned.

I agree that what happened to the main couple, and even the Class President (sorry, can't remember the name) are realistic. Those things happen in real life, even though we don't think great love like that of Baek Ji Yin and Na Hee Do should be like that. However, they are still just young adults. They still have so much to learn and grow.

However, my quibble is with the unrealistic achievements afforded to Yurim and Ji Wong. In real life, people with limited resources, as Yu rim's and Ji Wong's background were depicted, face a lot of obstacle when starting their own business. Passion and skills alone are not going to be enough. Funding is a big one. I can see that Yurim has a better chance to open her fencing school. However, given Ji Wong's family circumstance, where did he realistically get the support and resource to start a company that can buy and sell high quality products? The story would have been much more in line with the desire to be real if Ji Wong had a thriving blog but not a CEO of a successful company after 7 years.

Does it sound like I am salty? Yes, I am. :)