I had a Korean friend and his 3 months visitor visa is gong to expire. If he go to renew his visa at Cheng wattana , May I know how long is the visa can extend?
TLDR : Answer Summary
Korean visitors to Thailand cannot extend their 90-day visa exempt stamp at the Cheng Watana Immigration Office. Instead, they receive a 7-day 'extension denied' stamp, compelling them to leave the country. Alternatives include traveling to a neighboring country and returning for a new 90-day exemption, as extending a visa is not permitted for Koreans under current regulations.