I Underestimated the Obsession of a Crazy Person

Baek Si-hyun, summoned to another world by a god's request, successfully completes his mission to defeat the Demon King. But the joy of victory is short-lived, as Si-hyun must return to his own world to maintain the balance of the worlds. Without even a proper farewell to his comrades who had worked with him through thick and thin. Back in his world, living quietly, a man appears by Si-hyun's side. Someone who resembles a comrade from his days as a hero, when they defeated the Demon King together. And it's not just the face that's similar. The honey-dripping voice, the dog-like personality, even the cutesy way of dragging out the ends of his sentences. It's exactly the same. It's en...