This drama is a hidden gem. It has the potential to be the best drama of 2022. Every scene is well executed and the story of each character is well woven into each other. I love the relationship between the ML and FL, something that blossoms from friendship and mutual understanding. They meet and communicate very naturally and every moment they get to spend together seems so innocent yet so sweet. I'm sure we are all reminded of our youth, our high school times when we watch this drama. I am hoping for double digits!

Edit: I cry a river in the last episode. And promise myself to never watch drama from Writer Kwon Do-Eun again. Both this drama and SearchWWW hurt me so badly. She likes to portrait the reality of life, which I don't want to see in a drama. If I could sum up 2521 in one phrase, it would be a proverb from my country which is "Head of an elephant and tail of a mouse", meaning it started so spectacularly and suddenly ended so spitefully. I feel bad for Kim Tae Ri and Nam Joo Hyuk, their acting was phenomenal but still couldn't calm the anger from the audience. It's all the writer's problem.

Rewatch? No, I won't. Just like how you desperate try to forget your first love so you can move on, this drama will make your heart pounding so much for the beautiful memories only for you to cry your heart out at the ends. It's too much of a roller coaster for me.