I didn't realise what was wrong until it was far too late...

The video likely performed well due to the satisfying ASMR-like process of creating a beautiful, intricate phone case. The visual appeal of the seashells and the transformation from a plain case to a decorative one, combined with the intriguing "too late" hook, would have encouraged viewers to watch until the end.

The video shows someone creating a phone case decorated with seashells. The creator applies a white substance to a phone case and then carefully places various seashells and small decorative elements onto it using tweezers. The process is shown in a time-lapse or sped-up format.