It means the boys who a tall, pretty with a charming smile. Like most of young leading actor in Korea episode

It means the boys or even men are pretty as the flowers but it doesn't mean they are on the feminine side. Instead they are charismatic, have good looks, perfect complexion and are ideal boyfriends.

perfec boy

I've only heard of this being used as an insult - to say that a man is girly, wears makeup and is feminine. This word seems to come from a recent South Korean TV show of some sort.

is handsome boy！