Messages From the Killer is a completed manhua by Xinghai Anime (星海动漫) and A European Factory (有欧气工厂), first published in 2020. It blends romance, boys' love, drama and horror. You can read all 2 available chapters of Messages From the Killer online for free on MangaPulse; the newest is Chapter 2, added 2021-01-17. The series is finished, so you can read it from start to end in one go.