Screwing up your rival's business while flirting with them at the same time. That's Kim Kai's modus operandi. Meanwhile, Jongin? He only wishes Do Kyungsoo would disappear. Or so he thinks. Maybe. Going from rivals to business partners to maybe something neither of them saw coming, the three heads of the Korean underworld have more to worry about than just not liking each other, or maybe liking each other a bit too much.

When the sweetest couple made for each other become mortal enemies in just one day. "I'm the one who will end you brother's life." He said. "Even if that's the last day I live."