I have been watching some Korean dramas and recently watched ''Somehow 18'' here what i would say about it :
Well the plot is really inspiring and also gives a moral lesson that you cant change what is gonna happen , i am gonna put this one in my favorite list. One thing i would say that the thing they are trying to show is absolutely true, you really cant change anything which has happened even if you go in the past, no matter what, you can never change it . If it is decided by the fate it will happen and if repeated a million times it would still happen.
Its worth watching though.