I remember reading a novel once, the name seems to be Flowers and Locks, which is very suspenseful. It's about a small hotel where there are always dead people. ...

Science fiction, formerly known as Flowers and Locks, can't be found by the author or online. I'll say it again from memory: it's about the treasures left by Japan in the East after the war. The door is opened by a black technology called "taste effect", that is, it must be a white rose in full bloom at a certain moment. At that time, after the experiment was successful, someone happened to see the white rose open the door and someone was playing the violin, so they mistakenly thought it was music that opened the door.

After the war, this mansion became a hotel, and then because they wanted to open the door, they kept scaring people with the original back tunnel, so they kept dying. Another thought it was music, and kept playing the violin in the middle of the night, and finally found the girl with the white rose. Now, the female doctor who returned from studying in the United States opened the door and gave the treasure to the country. Two of the people who played tricks were former workers and cleaners, and they were all caught in the end. Over.