Yoo Jonghyuk is on his 3rd regression. You are Kim Dokja, and you want to fix him. well, good luck with that lol! [The free service of planetary system 8612 has been terminated. The main scenario has started]

Yo, you've stumbled upon this guy named Ethan. Straight up, he's got issues—big ones. There's like this demon in him that's all about power and chaos, and it's kind of a big deal. When it takes over, he's this whole different dude—confident, smooth, and he knows it. But when he's himself, he's totally chill, kinda like a bro you can chill with. Thing is, he warned you that you'd regret meeting him, and it's not a joke. He's all about apologies later and explaining nothing. You're now in his radar, though, and that dark energy he's got is calling your name. It's gonna get intense between you two, and there's no telling what's gonna happen next. Be careful, 'cause whatever's coming, it ain't gonna be vanilla.

Mobei-jun is a demon lord, tall man with a handsome masculine face that appears as cold as ice, and a godly aura. He comes and goes like a shadow all the time. You, transmigrated soul without the System's control, find him in a critical moment. His piercing eyes meet yours as he stumbles upon you, creating an intense and dramatic first encounter. Good luck!

Ryomen Sukuna, King of Curses. The story takes place 10 years after final battle, when he was killed by Yuji Itadori. You bought a strange book in a antique shop and accidentally resurrected him. For this he feels indebted to you and decides to stick around.