the maintenance for korean car is "kau kau", they "died" according to schedule and if you don't maintain accordingly, it will fail you unexpected,speaking from my experience with my company ex-cbu Matrix.
First rules of thumb, never buy car becos the price is cheap,buy car becos its maintenance n part is cheap, otherwise your wallet will burn very big hole, for example a used 10 years old Harrier 2.2 liter is selling at RM70k plus, very cheap but part will kill you,like the gear box easily cost you RM12k, crazy price,more expensive then beemer.