The story is pretty damn basic and simple, like it has nothing. An adolescent girl has a crush on her older brother's friend and never really moves on from it, rather it grows as she grows older and finally she falls head over heels in love with him and accepts her fate, only to get him to love her back in the end.

So why such a high rating and so much love from everyone? A lot of reasons actually.
1.  Simple story, no melodramatic plot, unnecessary angst, bloodshed, death or anything annoying.
2.  This is one of those very realistic stories where people can relate to the main leads. Also which girl didn't have a massive childhood crush, but never really got him and still would love to see what if it worked out? i personally could relate to the character of sang zhi all too well, that is until she got him to love her. So for me, their relationship is like the part that i could never experience with my crush. It made me happy, i swooned and it brought me so much peace and satisfaction.
3. The characters (except jiang ying) were all loveable. Their relationship dynamics was natural. Main characters had development. They were well written and mature.
4. The acting and visuals. Needless to say zhao lusi is a high traffic actress. And in my opinion she outdid herself in this with all her micro expressions. I was truly impressed  by her performance this time particularly. I felt everything she was feeling, her acting was so perfect this time. Her character wasn't a stupid airheaded crybaby who does dumb shit and behaves like a 3 year old. She is a beauty and chen zheyuan looked like he is straight out of a manhua with his visuals. How can someone look that attractive and sweet and charming all at the same time? His character was the perfect high school crush.
5. No unnecessary misunderstandings, plot fillers with too much spotlight on unimportant secondary characters. The story focused on the main characters.
6. The story was fast paced but editing was not choppy. The screenwriter and production team did a marvelous job at the whole process. With a minimalistic visual theme, it screamed elegance. This proves its high budget.

So despite being a simple drama in one of the most common genres of coming of age, it was soothing, relaxing, relatable and light romantic comedy with a happy ending. It definitely is worth rewatching because of these exact qualities. It is perfect in its own beautiful way. It was a very pleasant and easy to watch show and i would recommend this to any romance lover.