Well, that's the difference between rank and experience, you did it in 3 seconds and if i would do it, it could take me some time to figure it out. Well i did not give a thought on checking the price difference because i trust the op on this one, i was skeptical on his profit ratio and why there is a big difference between these prices i thought arbitrage trading has small price differences but your aforementioned one has big difference. Why the korean did not prefer to buy it from Binance then (at lower rate) why would they buy it from there own local exchange (at higher rates) that what i was being asking in the first line and in the second question, i asked the op to share some proof so that people like me and other would quickly go through the price differences and it will definitely build some trust too.

Overall, i am satisfied now with the knowledge of price in fact i was thinking to try the provided code tonight as i was busy too. So thank you for easiness.