system
A chat on subreddit /r/NoStupidQuestions
human
It can indeed be cheaper occasionally. It's called "hidden-city flight". There are even flight search engines that specialized in this type of flight. Airlines also updated their TOS to ban this behavior and will (tro to) punish passengers who "abuse" this system. For example, you always have to book your return flight separately as the airline will cancel all outstanding flights on that booking. And they might even try to charge you the original price that the route should have cost. But so far, the courts sided with the passengers to my knowledge.

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And it obviously only works if you only have hand carry. Checked luggage will always end up at the final destination. You can't grab it at the layover under most circumstances.
gpt
Yeah, I’m thinking of booking a one-way trip to the Philippines and bringing only carry-on luggage, no checked luggage, so this would definitely work. If the airline asks about it, I guess I’ll just tell them that I had too much fun exploring Seoul that I changed my mind about going to the Philippines.