Wow. I think you understood exactly what i was wondering. So in this case, the writer used word 'purge' to emphasize the meaning instead of using 'get rid of' or something. Am i right?

Yes you are right. It's more like "Written Korean" 앞으로 걸어갈 시간 = " The time you will spend" , " The future you are going", "The time you will walk along" another examples 앞으로 나아갈(나아가다 -> 나아가+ㄹ) 시간 = " It's time to move forward", " we didn't go forward yet but it's about time to do" 안으로 들어갈(v.들어가다 ->들어가+ㄹ)시간 =" It's time to get in", " We didn't go inside but it's about time to get in(or jump it or go inside)" Hope you understand Cheers DK

Both can be used as "도착하다" but they also can use as "reach to somewhere" or "reach to something" for example 그는 체력의 한계에 이르렀다(past verb of 이르다) = " "He faced his physical limit." 다다랐다.(Past verb of 다다르다) or 우리는 결론에 이르렀다.(Past verb of 이르다)= " We finally reached to the conclusion" 다다랐다(Past verb of 다다르다) They all normally used in written Korean. So in everyday Korea, I recommend you to use 도착하다 when you want to express "arrive" in Korean Cheers DK

If i give you a simple difference 1. 읽어냈다-(" Oh Shit I did! I did read this book until the end!!holimoli!!) It can be an expression that you achieve some goals. in this case, you finish reading a book. 2.읽어버렸다.- "Hey man...I finished reading a book you recommended. I have nothing to read now..." It can be an expression that you did something and feel kind of regretting of doing it cheers DK