I don't speak or read Korean, but I think kekeke might be a transliteration of ㅋㅋㅋ - I've seen that frequently enough in Korean language comments on YouTube that I've looked it up before. A quick web search led me to more Korean lols and hahas...
https://domandhyo.com/2017/07/lol-in-korean-%E3%85%8B%E3%85%...