Who is He

“Warning: Yaoi content: This manga contains materials that might not be suitable to children under 17. By proceeding, you are confirming that you are 17 or older.” The cheerful and optimistic brother died suddenly. Mu Siyang lurked into the school to investigate the cause of his brother’s death. The scares followed: his roommate was a friend; his brother’s rumored boyfriend wanted to kill him; all the guests of his brother’s work station wanted him… What did my brother go through before he died? Shéi Shì Nà Gè Tā / Who is He manhua / Who Is That He / 谁是那个他