This old gem has been recommended to me over the years and so I started it with high expectations. I advise you to reduce those expectations a teeny bit. Cheon Song Yi is such a breath of fresh air as a leading lady but I eventually got exhausted by the stoic Do Min Joon . It's a personal preference to have the leading man be expressive but praise to Kim Soo Hyun for portraying the role so well. With that said, I found myself more interested in the side story between Lee Jae Kyung and Lee Hee Kyung rather than the love story of the two main characters. Lee Hee Kyung is definitely one of my favorite characters.
The acting is great, genuinely funny, and definitely some scenes gave me slight agitations. With sci-fi elements and a sideline mystery, this drama sets itself apart by blending multiple genres into one central story without being overwhelming. The drama is also able to fall back on rom-com k-drama tropes we love adding to its charm. It's definitely a must see but because of it's unique nature your personal taste matters.