I Became the Villain’s Little Sidekick

Sinister, scheming demon lord seme × sarcastic, cowardly uke who clings to life

[Quick transmigration, two male leads, redemption, happy ending]

To survive, Dan Yun transmigrates into a book and binds himself to a System. His mission is to win over the villainous Demon Lord, Yin Mingye, and stop him from turning evil.

The moment Dan Yun arrives, the badly wounded male lead nearly chokes him to death. Desperate to stay alive, Dan Yun immediately backs down, then waits on him hand and foot, making survival his top priority.

Dan Yun plans to make his escape as soon as he completes the mission. But halfway through, he has to steel himself and offer up his own heart's blood to cure Yin Mingye's poison.

He thinks he's done it without anyone noticing, but Yin Mingye has been watching his every move from the shadows.

With the mission complete, Dan Yun packs his things, ready to leave and enjoy the world, but someone grabs him and holds him fast.

The sinister Demon Lord pulls him into his arms. “You saved me, and now you want to run?”

Dan Yun is on the verge of tears. Help! Who understands? I tried to win over the villain and ended up giving him my heart!

Please note: 1. This is a fictional setting. 2. It contains lots of original worldbuilding. 3. The romance won't progress too quickly, because the seme is a scheming villain~