This was my second "older" kdrama after "Boys Over Flowers", and I have to say this aged rather well in comparison. The acting from all of the actors was convincing and touching, the story progressive for its time and the execution was good too.

What I liked:

- As I said, the acting was good. It felt natural, everyone had great chemistry with each other and the interactions were very fun. Yoon Eun Hye did a really good job playing a girl pretending to be a boy and Gong Yoo was very fun as Han Gyul too, even though his character could be a little mean sometimes.
- While I don't have a standout song from the OST, I find the music perfectly fitting for the series. It was feel-good vibes and very chill, perfect to be played in the background!
- The romance was nice too. We got some nice kiss scenes, the intimacy felt natural and the main couple looked very very pretty together. It was nice seeing Han Gyul accept his own feelings after struggling for such a long time, he fully embraced them and was ready to just openly love Eun Chan. Even after he found out and they made up, both of them were so perfectly in tune with their feelings, which I really loved seeing.
- Eun Chan's relationship with her little sister. While Eun Sae is a more of a girly girl, I loved how she didn't make fun of her older sister for being the opposite. I liked how both girls could openly talk about boys, love and their feelings. This showed that Eun Chan may "look" like a boy, but at heart, she's just as girly as her sister and capable of having a crush and daydreaming. I also liked that Eun Sae hat Eun Chan's back and never threatened to expose the big secret. I don't know why... I did not expect the sisters to be rivals, but it was nonetheless nice to see their sisterly bond.

What I didn't like:

- Yoo Joo. This woman was so confusing. I feel like she treated her relationship with Han Sung like an experiment, especially in the last couple of episodes. What do you mean you want to "try out" marriage and then just get divorced if it doesn't work out? She said that while pregnant...?? It seems that she had a miscarriage in the end and that the couple wasn't able to have kids, but it is nonetheless to messed up in my opinion. To make your kid a child of divorce just because.... Also, her not seeing the problem with staying up all night with a bunch of dudes, DRINKING after JUST getting married and finding out you're PREGNANT? Oh, but Han Sung was the bad guy for trying to hold her accountable that she was not taking care of herself properly?? I also did not like the way she literally threw away a 9-year relationship (after cheating for one year during it) because her feelings are so fleeting or whatever... only to break up with that guy two years later and crawl back to Han Sung. AND HE LET HER?! THEN she was mad that his world did not revolve around her anymore because he had this temporary crush on Eun Chan. I don't know if I missed that part, but when Han Sung kissed Eun Chan, she said that he "cheated" on her. Girl, did you ever bother putting a label on your relationship, or communicating your needs to the man? She was jealous while still having contact to her ex-boyfriend whom she left Han Sung for. The audacity I swear to God. Telling Han Sung that he has a victim complex when hers is even bigger?! I also did not like how Han Gyul said that she kept their relationship purely friendly but... that is not true in the slightest. She never drew the line with him. "Hey, I'm you cousin's girlfriend, please stop coming over and flirting with me. It's not okay", THAT is what she should have said. Instead, she was basically enabling his crush on her, calling it friendship or whatever. I think she really liked having the attention, but girl, don't get mad when your "man" (Han Sung) is doing the same then.

- Han Gyul flirting with his cousin's girlfriend and having an active crush for almost a decade? Get some distance, man. Him kissing Eun Chan against her consent in episode 11 was unsettling to watch, and I hate how the writer made him apologize for the wrong reason. "Sorry for what I said. I said something to hurt you on purpose"... he should have apologized for forcing himself on her, she was literally fighting him off :(

- Grandma was a bit of a misogynist. I don't know who the "harlot" was she kept referring to in the early episodes, but that was just mean lmao. She was also always mean and yelling like damn, calm down. I also don't know how many times everyone had to repeat that Eun Chan might be poor, but also independent only for grandma to say "I worked hard my whole life to be where I am, just like you"... girly, did you need to be told Eun Chan is dirt poor 10x before getting it??

- Sun Gi was a glorified stalker lmao... Kim Jae Work looked beautiful though!

- The conflictS between Eun Chan and Han Gyul in the last 3 episodes were dragged out a little, I would have loved to see them more like a couple instead of them running in circles and always fighting.

- Eun Sae and the mom: Eun Sae was a big brat to Min Yeop, who was just a doormat :( Just like Ha Rim said: she isn't playing hard to get. She was mean and bullying the poor guy just because had a big phat crush on her. The mom not having ANY working experience is wild because she basically let her 16-y-o daughter carry the burden of earning money with crappy jobs and then has the audacity (granted, that was only in like the first episode) to spend that money on shoes she doesn't need lmao. Eun Chan had to give up so much of her youth and in all those years the woman never seemed to have tried to get some job, idk... didn't sit right with me. She was a sweet mother and woman but this particular thing was a little annoying.

Overall, this may be an older drama, but I think it holds up well today. The romance is cute, the characters have flaws but they feel real and the chemistry between everyone felt very real and natural. I had a good time watching the drama :)