In the bottom of their website is their address. Change the language to English and get the "English" address. Write both the Korean and the English address. Also write EXO and Chanyeol (both English and Korean) as well - just to be sure it reaches the right person.
Be aware that the safest way to give your idols something is actually handing them it in person in the airport, so if you have the chance (or can send your drawing with someone else who might have the chance), do that.
Otherwise - good luck. I hope it reaches him. ^^
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