We will later. It's still ongoing
Pretty sure Seungmin is some kind of Brazilian secret agent chasing the "drug professor"?
The bad guys originally made a mess of Brazil with that drug (that time it have different form).
Jun was already part of the drug lord team trying to branch into Korea or maybe he is the professor.
And he was looking for a test subject for the drug or something.
And decided MC is best target (I have no idea why)
Fast forward, Seungmin and his team managed to track down that the drug team run to Korea, but there was not much trace after, so Seungmin decided to get famous to act as a bait.
And his team build a club designed to lure in the drug team too.
And see which bait they gonna bite.
Coincidentally, Seungmin got involved with Jaeyoung, kinda in love at first sight, and using the "making song and sing together" to get close to Jaeyoung.
After several interactions, Seungmin figured out that Jaeyoung may have some connection to the drug, a clue.
And figured out how Jaeyoung has suffered.
Therefor Seungmin now have more stronger reason to chase on the drug guys to put an end on this, to keep his love Jaeyoung safe.
thank you sm
did we get why seungmin is connected to this