Read First Love Operation Manga:
Yeonwoo and Jisoo are childhood friends and despite knowing that both of them are aware of their feelings for each other, instead of being able to express them through words, it becomes a misunderstanding and conflict. Although they both go to the same kindergarten till college, they still don’t have the right time to confess to each other. As time goes by, the obstacles that those two have keeps more.. increasing. Whether it’s Yeonwoo’s confession or Jisoo’s confession, neither of them succeeded at it and instead, it seems like the failures have slowly kept them apart… When will they be able to convey their feelings?