Hogwarts Memory Wizard

Unlike other time travellers, when Lucas Harker traveled through Hogwarts, the Sorting Hat had already sorted him into Gryffindor House. Just when Lucas was regretting that he couldn't live next to the kitchen, he gained the ability to read the afterimages of memories left by his predecessors. Through these afterimages, he can not only learn advanced magic skills, but also peep into the secrets sealed in time. How did the Marauder Four create the Marauder's Map? How did Severus Snape come up with such an ingenious way to optimize potion recipes? What did Dumbledore teach Tom Riddle in his first Transfiguration lesson? When Gryffindor and Slytherin broke up, what kind of fight broke out between them? Of course, the location where Fred and George hid their contraband was hidden from the eyes of the memory wizard Lucas. He believed that when he dug out those "treasures" in front of the two brothers, their expressions must be very wonderful.