Please anyone who can tell me about this manga

The manga I've been finding is about female childhood friend of the mc has a crush on someone who is a boxer(I don't remember if he is a champion or not)
She is a bit tomboy
MC want to help Female lead by helping her study but she gave up she broke the promise she has with the MC
I don't remember much after that but I remeber MC told her he love her but she reject him and tried to avoid him until he gave up his love in the end she regret it and want him back