Isn't Love a Luxury in a Zombie Game?

Yuwon, who cleared the notoriously difficult zombie game with a no-damage run, wakes up inside the game the next day. As the ex-boyfriend's boyfriend of the protagonist! [Join 'Seojun Lee' within the time limit. Time remaining until the zombie outbreak: 09:59:10 <Reward>: Return] The system says he can return home if he achieves a no-damage clear with Seojun, the protagonist, as instructed. But the problem is, 'What kind of crazy trash drama is this unfolding into?' Seojun is a love-crazed bastard who would do anything, even endless regressions, for his ex-girlfriend. If he gets caught being the ex-girlfriend's boyfriend, he's as good as dead. But Seojun, who was trying to use him...