If he’s sent back to Korea, it’s important to note he won’t be “extradited” in the formal sense. Thailand almost always just deports foreign scam suspects. That means he’ll be put on a plane and handed straight to Korean police on arrival. South Korea is strict on financial crimes, but nowhere near as harsh as China. In China, large‑scale fraud can lead to life imprisonment or even worse in extreme cases. Korea doesn’t go that far. Even for big scams, sentences usually fall in the 5–12 year range, with longer terms only for massive losses or organized criminal activity. He’ll almost certainly be arrested immediately, held without bail, and prosecuted, but the penalties in Korea are tough, not extreme.