The match wasn't fair, it was obvious a hand ball. If Fluminense was able to equalize the points, the result might be different. Both Cucurella and Pedro plays big role, Cucurella saved Chelsea from goal by his clearance, Pedro score 2 goals, but they also get helped by referee.
Personally I'm not happy with the results, we will see a boring final, not an unique final where a lower tier league team match against top team.
PSG will beat Real Madrid, it's easy to predict.
The penalty was very clear, and Fluminense were badly beaten
The ball hit the Chelsea player's hand, his hand wasn't close to his body and got in the way of the ball
There are no arguments to justify it
Unfortunately this time the team was badly beaten by the referees.
Look, there's no way you can say it wasn't a penalty

There's a video to watch, only 7 seconds
here