Bayern Munich and Leverkusen are both very strong and well performing teams. Due to which the match between them was difficult. If you have seen their match, Leverkusen also managed to score only 1 goal, although they are also a strong team. The reason for this is that Bayern Munich's record is very good and strong, if you look at their close matches, they have only lost 2 times, so I don't think there will be a better record than this because they have a stronger team in their record. Even a match must have passed with defeat. We should also see that Leverkusen is better than Bayern Munich which is why they won this match but it would not have mattered to Bayern Munich but they will definitely want to win this match because they are a strong team.
Leverkusen were the winners anyway. They benefited from the red card that Munich got. However, they didn't really play with an advantage over Munich who in fact were also able to create quite a lot of chances.
The result might have been different if there was no red card at the beginning of the first half. But this is football with all its surprises, Munich must accept this result and can focus more on the Champions League and Bundesliga.
In the 17th minute, Bayern Munich's plans were ruined by a red card received by their goalkeeper. Manuel Neuer put his team in a big trouble by receiving this red card. Leverkusen became more effective after the red card and finally managed to score a goal and win the match. They were eliminated from the German Cup and now they have no chance of winning the German Cup. They have to focus only on the Bundesliga. Meanwhile, English forward Kane has already lost a trophy.