Do you want to watch it but you are not sure because of the bad rating and reviews? Read this. I'll try to make as little spoilers as I can.
I've watched this drama 4 times already, and I finally forced myself to write this review.
This drama is about a forbidden love, in consequence the story and characters are difficult to watch for some people. I'll explain it in a very simple way:
-The main lead fell in love with an amazing woman but she passed away in an accident, he blames himself and actually we can say it was his fault (sorry, I do think so c: ). As time passes by, in a way of healing and some how to clean himself from his guilt, he establishes a daddy long legs relationship with his ex's little sister, he is basically her sponsor. -If you are into grow men in their early 30s you will love how good looking and good actor this man is -
-The main girl, is a very common girl, she is kind but has strong opinions and sometimes she is blunt. She has no one to rely on after her sister passed away, she doesn't even has the talent her sister had once. Without anything special, one can believe that she is the type of person you'll forget as soon as you meet, she is literally an ordinary girl. But there is something, maybe is the fact that she is depressed yet keeps going, maybe is that she works hard in anything she can so she can survive, literally survival instinct, maybe is that she is not afraid to ask for help and is not as innocent as it looks, maybe is her long hair and big eyes, or maybe is her bad luck. Who knows? Destiny and her dead sister lead her to meet the ML and then you get the title of this drama, it can be explained because of the ML, he is the one that finds her sweet and interesting. The one who helps and stays by her side.
-The second lead, in my very honest opinion I found him arrogant and childish in the beginning. He likes the main girl but he is too childish to notice it and he thinks she has fallen for him, which was really awkward for me. All in all, she just sees him as a friend, that's all, nothing else. As the story develops, he grows, he becomes confident and gentleman. Is nice to see him become a better man, but he won't be able to be her partner, so, you, as a viewer might develop a second lead syndrome. -If you like guys that look cute in their early 20s this is for you-

Keeping all of this in mind, is understandable that the FL needs someone strong and reliable by her side, she cannot keep living on her own as a young adult and needs help, she is not afraid to ask for it and that is something sweet to watch. Adulting is difficult and sometimes you can't understand what or how to do it, so, it is very nice to see the FL accepting help and saying: "I can't do this anymore". You might say she is still grieving and depressed, many people can relate to this.
However, she tries to work hard to stand up again, with some help she can do it, her friends are also very supportive, I've to say they are amazing, a young couple living together without getting married, in S.Korea?! that is new in a drama. Veryyyy, veryyy new, I loved this couple tbh.

The music, this component for me was awesome, I still have their soundtrack and listen to it pretty often, I LOVE IT.

Some people say the actors had little chemistry but I don't think so, the age gap works perfectly and I myself have watched interviews and bts cuts, I've to say they are very interesting together and somehow their dynamic of "I tease you now"
"you tease me later" is pretty catchy to watch. Plus, they are both so good looking.