He Fell After Being Transformed into the Demon Lord's Old Enemy Brother.

[Two male protagonists+HE+sweet and sour+senior brother literature+nianxia+double cleanliness] [Rebirth, Black Vinegar, Sensitive Demon Lord Attack × Penetration of Books, Gentleness, and Occasionally, a Sha Sculpture Group Pampers a Beautiful Woman] Zeng Qing×Lu Liuhuan Lu Liuhuan passed through and became the old enemy brother of the male protagonist in the dark novel. The kind where the hero and the hero die together in the final battle! It just happened to be bound to a redemption system that would result in "dog leash" if you refused the mission. Lu Liuhuan had no choice but to bite the bullet and start saving the Demon Lord. But fortunately, he returned to the time when everything had not happened, and the Demon Lord was still the innocent little junior brother. Everything came in a hurry! However, just when Lu Liuhuan was working hard to cure his gloomy, pitiful and sensitive junior brother, The younger brother's eyes gradually became dangerous... ———————————— At the beginning: "No, what's wrong with you, senior brother? I'll call the doctor!" Later: "Senior brother, senior brother, you have been poisoned. How about asking Ah Qing to help you?"