While Finnish is not a Scandinavian language, Swedish is an important language in Finland. So much so, that it holds official language status together with Finnish.
Swedish is spoken mostly on the western and southern coast of the country, while as many as 5% of Finns consider Swedish their native language. And of course, Finns also learn English at school too! So Norwegians or Danes who can't get their message across in Swedish can always switch to English.
The Nordic countries consistently rank at the top of the UN's annual World Happiness Report. But by 2020, Finland leapfrogged the rest to finish top of the pile. The rankings take into account many factors. Life expectancy, freedom to make life choices, economic strength, generosity, social support from friends, perceived corruption, and views of the survey respondents.