Not a single word or even two, but quite a mouthful: something that grows on you. It is used for something that was initially not easy/likable to you but later (with experience) became otherwise.
He encouraged me to continue to study computer science, because he thinks that computer science is something that grows on you.
He encouraged me to continue to study computer science, because he thinks that computer science grows on you.
TFD:
to become increasingly liked or appreciated by you
At first the show seemed kind of weird, but it grew on us.
Cambridge Dictionary of American Idioms Copyright © Cambridge University Press 2003. Reproduced with permission.
