First of all i would like to appreciate both Nam joohyuk and Kim Taeri's acting. I mean both are such experienced actors with so much talent.
Twenty five twenty one is a very relatable drama, i mean it showed how teenagers go through changes in their personalities and how do they feel during relationships and after break-ups. It also showed the strong friendship that a boy and girl can have. It also showed a stress of a topper student like except studying she also wanted to try out so much things but due to the education and the school rules they couldn't.
Now lemme talk about the characters i mean Na-Heedo has such a cheerfull character, she tries to keep herself happy and joyfull despite of having such bad history and not getting supported by her mother. Now Baek-yi-jin after his father got bankrupt he still didnt loose hope and was very dedicated to find a career to earn money. He also had a very caring and friendly nature towards Na hee do i mean every interaction of them in the drama gave me butterflies in my stomache and i was hitting my head in my pillow. I am not going into details about the other characters cuz this will give spoilers to the readers.
I would recommend everyone to watch it and i am.sure that you will relate yourself to this drama!