My Wife Is a Monster

[Two male leads, modern setting, one male lead is a vampire] Nan Yue had just climbed out of his coffin when he met a human whose blood smelled delicious. Later, so he could stay close to this human, Nan Yue moved in with him.

Nan Yue thought that even if he couldn't drink the man's blood, being able to smell it every day was pretty nice. He just never expected he'd end up giving his own heart away.

Si Junyan fell for Nan Yue at first sight. He invited Nan Yue to live with him partly to repay him, and partly for his own selfish reasons. He knew Nan Yue wasn't an ordinary person, but he couldn't help wanting to get closer to him, even though he knew Nan Yue had first approached him because his blood smelled so delicious.

Later, they discovered that everything had been destined long ago: a tangle of fate and a cycle of cause and effect spanning a thousand years.