What's the difference between shounen ai and yaoi Yaoi has smut and shounen ai doesn't?

I mean like we never knw, because I've also seen a "north Korean" girl leaving her country and is being hunted down by the government.....
Anything and everything can happen, specially actors.
But welp can't expect the worst.
(Mostly it may/can happen due to the contract as an actor with their company, bcoz the company link to him will lose an important figure and may threaten to take back all what he has earned and specially Penalty fees(incase he leave in the middle of the contract))

Oh yeah I've read this kind of stories in manhwa
Where a ml or fl cancels their contract and then the company is like "if we can't have you no one can have you huhuhukukukekeke"

(It does happens in reality but it never makes it to the public sedly)