My Phone Sucks Blood

After Lin Xiaodai was robbed, she discovered an all-powerful demon lord on her phone.

She treasured him like a priceless find and used threats and persuasion to get him to sign an agreement to help her win over a man.

But she never expected the demon lord to nearly slap her romantic rival to death. As Lin Xiaodai tries to save her rival, she travels to the underworld and even returns to her past life...