I’ve never been asked to show a return ticket regardless of type of visa…even today I boarded a flight for Thailand. No one checked my visa and I don’t have a return ticket. I wouldn’t worry about it. Like someone else said you can extend for 30 additional days when you arrive.
Thank you. I am just wondering how it works that I don’t have a visa, but only an extension of stay.. I was on a Non-ED and then (without leaving the country) applied for a non-O visa based on marriage and then was given this stamp?