Rental Namchin

Eugene receives a wedding invitation from her long-time crush. While drinking to relieve his disappointment, he happens to see an ad for a 'rental boyfriend' - and he becomes entranced by a man with a style similar to his crush and signs up to be his rental boyfriend...
"You signed up, rental boyfriend?"
But what's this? A man with a completely different, fierce appearance than the one in the ad shows up!
"It was originally only available to women... but I'll make it special just this once, rental boyfriend."
There's no way... he can't tell him that someone completely different showed up! What should he do...?