Real Madrid is now aware about their problem and started to fix it. They successfully sign a young potential CB from PL club, and more to come. I absolutely agree about they being so careless with their defensive line this season, but seems try to fix it as a part of preparation for the upcoming season.
A new CB already secured, more CB and wing back to come soon. Just wait and see.
They actually thought everything was perfect until they found out it wasn't. But think about it... who could have thought the injuries would be this severe and there would be so many flops with the squad they had? Maybe me!

Although, I never believed that much in the squad right from the onset.
Hopefully, next season will be different with their new signings, and I hope they get the best out of Mbappé as well.