No, the Bai Yueguang I Replaced Is Really Your Brother?

As title. Su Yi thought that he and his roommate, who was cold on the outside and hot on the inside, contradictory in words and deeds, liked each other. It turned out that he was just his substitute for Bai Yueguang. When he escapes, he chases him, and he cannot fly without wings. His birds, when tired from flying, always return to their nests. And this nest must be cast by him. Sadomasochistic love is deep, life or death (not). The result... Huh? Wait, the younger brother you are talking about (Bai Yueguang), is he really your biological brother? ! ! ! [Love sand sculpture attack·Lu Yan × Would rather die than submit·Su Yi] (Purely sweet and without residue, feel free to eat!)