[UNOFFICAL TRANSLATION]

Four years ago, the idol group Dream Boy disbanded after getting caught up in a scandal, going down the "flop idol" route.
Now, in the present...
Jaeyoung, who used to be "Happy" from Dream Boy, is struggling to make ends meet and working part-time as a delivery driver when he hears that Sugyeom, the group's former leader, passed out drunk at a club.
He rushes over to help.
Seungmin is also called "Happy"—but unlike Jaeyoung, he's currently one of the hottest rappers and producers around.
There, he saves Jaeyoung when he collapses from photosensitive epilepsy, and then makes him an offer:
"You know who I am, right? Let's work on something together."