On
http://mona.happyminers.net/ It says "Overview MONA/BTC: 23.70000000" In my dreams

Something wrong or im very stupid. I will be rich if I get 1BTC for every 23Mona

This happens a lot for coins that are not yet on exchanges. Pools often seem to default to the LTC/USD price (haven't researched why, just noticed that it always seems to happen). Currently, the BTC-E price is $23.68 USD per LTC, just $0.02 from the price you saw on happyminers.