Mountaineering (now in it's Xteenth edition) is comprehensive in going over almost everything you need to know about climbing (trad, aid) and mountaineering in all of it's aspects. Slightly dated editions go cheap. John Long is an excellent climber and his HTRC has been translated to Korean among other languages. He also has updated the guidebook. (He's also well know for some of the best climbing "fiction".) To that I'd add the more basic Betty and the Silver Spider, a comic-book format guide to the basics of gym/sport climbing, hitting on training and basic safety/etiquette/jargon. It's by Craig Leubben (who co-wrote Advanced Rock Climbing with Long), a prolific climber, writer (inventor of the big-bro offwidth-crack protection!) currently a climbing guide and instructor in CO.
Though as Amanda mentioned, it's a good idea to supplement reading with practical experience. (Or in Korea, not a bad idea to supplement practical experience-- if you're being taught in Korean or broken English-- with good reading!)
I think most experienced people on KOTR would be happy to show beginners what we know-- some things I'd like to review and practice myself, as I do so little multipitch, trad and aid these days!
"If you can't do something well, you might as well learn to enjoy doing it poorly."
-- from a de-motivational poster, but I find it oddly liberating