It's true that Arsenal winning with Real Madrid's will act like a boost of their confidence but you have to consider also that PSG has a very strong home records of winning in the champions league season.
Ousmane Dembélé hamstring injury creates a disadvantage for PSG , but I hope he will perform in 2nd leg also. PSG controlled the early stage in previous match despite of being away match. Theis works like charm while Arsenal couldn't make it.
Betting Odds are also in favour of PSG, although it's a football match anything can be happened. But over turning on UEFA champions league in home-leg is rare. Hope we will se the best performance from Arsenal
The Champions League is full of strong team competition. And not a few we always see surprises beyond our initial predictions. PSG won in the first leg and they will play at home, they definitely have an advantage. But we also have to know that this is a match that determines everything. Arsenal will definitely treat it like a final, it's like when they faced Madrid with incredible determination and hard work. We didn't see that in the first leg, and I think Arsenal will go all out for the second leg. The result, of course we don't know anything yet.
PSG is one goal ahead of Arsenal and it is not a big lead. If Arsenal can score a goal in a short time after the match starts, then the game will return to parity again and then it will be a tough competition. PSG has defeated Arsenal at Arsenal's home ground, which is definitely an advantage for them, but still PSG has to be careful at home. Just as Arsenal lost to PSG at home, PSG can also lose to Arsenal at home. Maybe Arsenal will fight with their best in the second leg and try to beat PSG but PSG will not sit still, similarly PSG will try to ensure the Champions League final in any way. If PSG can ensure the Champions League final, then they will have a good chance of defeating the opponent they will get in the final.