According to the legend of plague, to save the blacksmith's son, the following steps need to be completed:

1. Chapter 16 of the game "Coronation", enter a place called "Alley", where a mouse nests. Go along the alley, then adjust the angle of view, aim at the door lock and throw stones to open the door.

2. After opening the door, continue to return along the original road, and through the newly opened door, you can find the "Laurie Furnace" at the end of the road.

You can unlock the trophy after talking with Lauric.