People United to Protect the Monarchy had collected evidence of online posts made by Ji Gamin, 31, on the day she arrived in Thailand on Nov 3, said Songchai Nianhom, the group’s president.
The group wants the woman to face charges for acts that violated Section 112 of the Criminal Code, the lese-majeste law, the Bangkok Post reports him as saying.
It alluded to pictures that were posted of the woman making “certain gestures” that could be considered offensive. Ms Ji also has 292,000 followers on Instagram.
The group has also asked the police Technology Crime Suppression Division and immigration authorities to investigate whether Ms Ji had a permit to work in Thailand, as she earned money promoting products and from other commercial activities.