The man in the oyster mask was on the latest season of "The Mask Singer," a singing competition involving masked celebrities in elaborate costumes. Their identities are revealed only when they are defeated. Videos from the competition were viewed more than 3 billion times in 2017.
The oyster singer was on the Thai series, but there are also Korean, Vietnamese and Chinese versions. An American version is also in development from Fox, according to Deadline. He was later revealed to be singer Panthapol Prasarnratchakij from the Thai rock band Cocktail. (Here's what he looks like in real life.)
Rounding out the top five trending videos of the year are:
Correction: A transliteration error from Thai misspelled the oyster singer's name.