Yes, the little man (Mario, who was hit by Lu Yiji with a hammer) will have a red exclamation mark standing on his head. The transparent depressions in the town are invisible. There is an old man in the lower right corner of the town. Talking to him can be followed by a task, which is to find 10 beans and gems in the transparent depression. After the mission, you can smash Mario and walk around. If you find the red exclamation mark, switch places. Then he will give you a brother lock (brother badge), which is useless, but the BP value is nearly half of the original value. It is not recommended to spend so much effort to find this thing. Most transparent depressions outside the town have an "X" on the ground. Same as above, you can get a Lala bean by beating Lu Yiji. By the way, you should know that 25 beans can grind coffee.