Mavericks said:
And one more thing: why "I love you - I know" was "a comic relief"? There wasn't any "laugh-out-loud" feeling about the whole scene.
Really???
The whole theater bust out in laughter when I saw the film in 1982... :-/
I'm not saying this applies to you, but sometimes, people for whom English is not their first language have also expressed their confusion as to why the line is considered funny (and trust me, I'm not the only person who thinks it's funny...at least I don't think I am!)
The humor doesn't translate because it's funny not in a literal sense, but because it's not expected. The obvious reply would have been "I love you too". But when he replies "I know" he's basically saying "of course you love me! I'm totally irresistible!", showing his narcissism. It's also funny because he's possibly about to die...but his huge ego still won't allow him to admit he loves Leia.
Someone sent me a greeting card once that had a pic of Leia and Han about to kiss. She has a thought bubble above her head that says "I'm the luckiest girl in the universe!" He has a thought bubble above his head that says "She's the luckiest girl in the universe." ;-) Basically the same idea.