I plan to go to Finland with a French visa and transfer to Lufthansa. What should I do?

The first landing place after the plane enters the Schengen area is where you go through the entry formalities. According to your itinerary, you will go through the Schengen entry formalities when you transfer in Germany.

If your French Schengen visa is a one-time visa or a multiple-entry visa for the first time, the main destination of your trip must be France, otherwise the German entry inspection officials can refuse you entry.

Obviously, you are taking a risk.

When you enter the country, German border inspectors will almost certainly ask you the destination of your trip (in Schengen, German border inspection is stricter). If he believes your answer (you say France), you will be lucky and your adventure will be successful. If he doesn't believe you, he will ask you to show me your ticket to France or hotel orders in France (he won't look at your travel itinerary, just as your oral answer is unconvincing. ), in case this happens, you will be miserable and I'm afraid you have to go home.

Of course, if your French Schengen visa is multiple round trips, you can go to any Schengen country for the second time and later, and you don't have to go to France.