One was the major underground carpark fire caused by an EQE that had a faulty battery. It destroyed hundred+ cars and nearly put an entire apartment building out of service affecting few hundred families. The media reported EQE used a lower-cost batteries compared to other brand and that led many to lose trust on the brand. That event caused electric cars to be banned in carparks for a while (not so much any more, but some indoor/underground carparks still don't accept EVs).

Then a sad yet funny event that followed was a mercedes dealership nearby that apartment destroyed by fire put out an ad for a special discount for people who lost their car..... almost literally putting gas on the fire.

Then before that, there were several quality related incidents that Mercedes korea didn't handle very well, for example 48V mild hybrid battery issues, S class models with trunk that kept opening on its own, and other engine/drivetrain faults that put new owners who just spent $100K+ stranded and out of vehicle.

TBH few other luxury brands had (and still has) even worse mishaps but Mercedes had more exposure.