i mean he must’ve earned a lot of momey from being a rut partner, that money he had on hand was probably because he thought he was going to buy something at the market he was at, he wanted to blow as much money as fast as possible right? Since originally it was money meant for his aunt’s treatment, so you carry a lot of cash since a lot of times market vendors don’t have a way for you to pay with card, so cash
Its a big sum on its own but not when broken down in terms of a salary in Seoul, like they said thats 80k a year which is typical for a mid level corporate job anyway and with living expenses he wouldn't have much leftover at all, he only has that amount since he didnt spend it since he did multiple extra jobs to survive, so in terms of getting paid to be the rut partner of a chaebol its peanuts. See this comment ╮( ̄▽ ̄)╭

I'm more concernet on how he dropped 830€ so casually lol