Kakao ended the English names a year or so ago due to inevitable confusion, but now people are supposed to add the "nim" (dear) suffix to each other's Korean names instead, which sounds creepy.

The funny part of the Kakao CEO asking to be called Brian is that there was a K-drama (Search WWW) with a fictional tech company, but they also made the CEO name Brian. I suspect if this idea had gone on every CEO would be called Brian.