@lanodan As far as I can say every kanjis has at least 3 way to be pronounced (japanese/chinese + when standing alone they often have a totally new prononciation) + a shitload of exceptions.
This is so weird to learn, it's like an intentional brainfuck sometimes ^^' (and like you should try to learn to say "1-9 thing/day/person" : THEY ALL HAVE FUN EXCEPTION NESTED IN IT JUST FOR FUN