After all, Chelsea is currently the holder of the defending UCL title and also, in the previous season Chelsea managed to get rid of Madrid in the semi-finals until Chelsea finally won the UCL title last season. Now in the quarter-finals, Chelsea will play again against Real Madrid and of course Chelsea have the motivation and ambition to make this good record continue. But yes, as well as Real Madrid, as a big team they will not give up and will try even harder to beat Chelsea as a way of revenge. With the motivation and ambition of these two teams, of course the match will be tight, I personally find it difficult to predict something like this because both have a chance to qualify.
Sometimes it is difficult to repeat a nice history, Chelsea had a nice history last season at UCL but maybe like last year Real Madrid were eliminated because Chelsea precisely this season instead Madrid eliminated Chelsea, although this is not an easy match to predict and in this first leg match Chelsea are more favourite because they play at home, Chelsea need to win with a big score because if only with a score of 1-0 or 2-0 Madrid is very likely to chase it in the second leg.
Looking at last season's game between Chelsea vs Real Madrid I think it's difficult for Real Madrid to win the game.
I'm sure Chelsea will repeat last season by getting rid of Real Madrid again. But if we talk about winning the Champions League this season I doubt that Chelsea will repeat to be Champions again.