Korean way of measuring a man is to get him drunk and see how he behave.  This is because Koreans tend to hide their inner thoughts and feelings.  Same method is used to communicate thoughts and feelings that violate normally strict social and business hierarchies.

While drunk, a subordinate can tell his boss what he really thinks of him.  Next day, the abused boss can't broach drunk behavior because doing so will embarrass the subordinate, a taboo of sort.  Even if the boss is stupid enough to ignore taboos, what can he do if the subordinate say "I don't remember."  Inability to remember drunk behavior is called 'cut film' and happens very frequently among Korean men because Koreans drink hard when they drink.  How hard?   I think Korea's only competition is Russia.  Its pretty bad, but thats how Koreans make friends and relieve stress.

This unusual 'feedback' system exists because Korean society is very forgiving toward what you do and say while drunk.  Even the law is suspended to some degree, allowing one make up for abuses to people and property with a sincere apology and other amends the morning after.  Although very unhealthy, the system seems to works.