Hyeong-ui Omega

Do-Yoon gets swept up in the heat cycle of Su-Ah, whom he has cared for and loved since they were little, enough to believe he was his own younger sibling and ends up in a relationship with him. Even though he is a beta, he wants to help Su-Ah, who is suffering from heat, but this is the first time he has been crushed by an omega... Is this really a heat cycle?

"I'll work harder because you like trash like punks."

(Source: MrBlue, translated)

Note: Includes evelen extra chapters.