It's when you would do anything (not to, but) for him/her. Looks don't matter. Nothing does, except for their personality. If you truly loved him/her , then you wouldn't give a heck about what people think of that.
(Fun fact: The Korean word for love is 사랑. You say it like 'Sarang')
It could be called a crush, or puppy love, but I think I've found true love.