Detective Yu Mingcheng: to Alice

It was originally a happy day, but Gao Mengying's sister Gao Mengying received a call from her alma mater: a teacher died in the lobby. On the way to explore the truth, they unexpectedly learned a piece of news: the teacher died in exactly the same way as a student three months ago! Is this a coincidence, or is there another truth? A ring dropped on the ground became the key to the case. They followed this clue, but the result surprised them...