Some pro told me my opening needs a lot of improvement. What books are good for that and what other training method work to improve my opening?

Don't play moves just to be crazy. Use joseki dictionaries.

Ignore every piece of advice anyone who is not demonstrably five stones stronger than you gives you.

Disclaimer: I am filing this under "training method".

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Except for all the exceptions.

Whenever we make any generalized blanket statement about practically anything about Go --
proverbs, tesujis, directions, fighting, etc., or anything about how to teach,
how to improve, how to study (e.g. who to listen to, and who not to listen to) --
we're in trouble. Because in Go, the exceptions are the rule (except when they aren't!).

• Kyu people, even beginners, sometimes have good advice; sometimes, they also have bad advice.
• Some pros give good advice. Some pros give bad advice. Even the same pro can give both good and bad advice.

One very tricky thing is to figure out who to listen to, regardless of their Go levels.
(The smart thing is to take all the good advice, even from a beginner;
and ignore all the bad advice, even from a pro. -- This is the difficult part to accomplish.)

⁽¹⁾ An image of antibiotics came to mind -- (another blanket approach) sure, they kill some of the bad cells, but they also kill many of your good ones!
⁽²⁾ Ironically, isn't this self-referential?

Did you get a chance to ask the pro what to do about it?

My teacher also says that my opening is my biggest weakness but he has no suggestions other than;
1. Improve life and death
2. Study(like reeeaaaally study) joseki
3. Memorize pro games(not study)

Through the complete combination, he says you will have some moments of enlightenment.

This seems like a study regimen for children's minds and most of his work in Korea was with very strong children. Anyway, he said that he doesn't know a different way for adults.

I think that is the sort of advice that would probably be true for just about anyone. Like, "hey why don't work on your opening.", unlike tsumego, which only gets prescribed to weak kyu players.

Who is your teacher?

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He's a baduk professor from Myongji. In the states consulting with our university for AI research.

He's a really good teacher!

Neat, thanks. You're lucky to have such a resource.

By the way, when you say "reeeaaaally study" joseki, you mean to understand all variations, trick plays, etc., for a given joseki?

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be immersed

The variations and many deviations, the follow-ups, and direction of play. The main thing I've learned from him(besides how to love tsumego) is how much there is to study simply from joseki. It's such an extensive resource to tap into.

1) For books, see my answer in the books forum.

2) Simply go through many professional games' openings.

3) Although a bit early, if you also want to surpass 3d, learn using influence and thickness well, so that you can fully appreciate such created during the opening.

emerus, I'm curious -- if you don't know the answers, that's OK, too --
( My understanding is that in China and Korea, most or all the pros' teaching experience
is with children, especially high-dan children; they have very little to almost zero experience
teaching Go to adults. In Japan, the situation may be different. )

• How much experience does your teacher have with teaching Go to adults? ( Very little or none; medium; or extensive ? From what you wrote, I'm guessing he has very little experience teaching adults in Korea; but perhaps he has more experience teaching Go to adults outside of Korea ? )
• If it's very little or none, then we may not know the relevance of his suggested study regimen for children when applied to adults.
• If it's medium or extensive, and he still does not know other methods for adults, then what's his "success experience" when teaching adults?
• emerus, I don't know your age range, but if you are an adult, and your teacher has very little experience teaching Go to adults, then perhaps a second opinion would be interesting -- perhaps other pros with extensive experience with adult students may have a different assessment of whether your opening is your biggest weakness -- perhaps they would evaluate that your opening is not your biggest weakness, but something else is.

emerus already indicated that his teacher said he didn't know of a different teaching method for adults...

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be immersed

Thank you to all who have given advice.