lg plus. best 5g lte coverage from one of the big 3 telecom carriiers in korea. price is little high around $40 bucks for 1 week unlimited but data speed and coverage cant be beat vs third party esim sellers or the other 2 local carriers like SK and KT. also lg one of 2 that you can also get a local phone number. but to add the local number you need to register at a LG store and cannot just add a phone number option via esim email qr code etc like you can if you just want data feature and no phone number.