Can we know your living conditions in South Korea? Because depending on where you're in the country, the expenses will be different and if you're in Seoul, you're going to need all the money you've got and those that's sent to you because Seoul is one of the most expensive city in the world. Check your expenses and try to maintain a 1 week routine and see if there's any money left before the next aid comes, if you're struggling to make ends meet at that 1 week routine, you probably need to focus on daily expenses first before investing in bitcoin. This advice is purely my opinion so take it with a grain of salt.