There were so many things in this k-drama that I found certainly questionable, but I won't lie, I was entertained most of the time. But here I'm going to mention why I think it could have been so much better:
- It was hard to empathize with the main male character, I didn't feel that the reason he decided to steal (yes, steal) his brother's fiancée moved me enough to get to understand him, therefore, everything he did to achieve his goal didn't seem noble to me and his redemption was resolved so easily, all for the convenience of the plot.
- I didn't believe enough that they were so in love at the time they confessed it to each other, much less on her part. I understand there was some attraction, but directly making it seem like they couldn't be without each other didn't make it realistic, I feel like that wasn't built up very well. When I saw them acting like any couple I didn't believe it.
- The character of the brother and the approach to his sexuality was so superficial, I couldn't connect enough with him either, I think they could have put his story to better use and not just have him be there for plot convenience, again.
- Another thing is that many times I felt that the tone of the plot was lost, I didn't understand if it was a romantic comedy, something dramatic or who knows what else. The truth is that they didn't know how to balance it. Rush and superficial.
- The side stories offered NOTHING.

But I will put as plus points, the OST because I personally liked it, especially the song 'Butterfly', also that I have seen the actors' work previously and I consider them to be pretty good, but of course this is not their best work. And also something in favor were the cameos in the last episode (especially Kim Beom and Lee So Hyuk) lol.
Overall, I wasn't bored, yes, it was entertaining, but I think there was a lot of wasted potential. It wasn't horrible but it certainly could have been a lot better.