1st classroom
Find a lighter and a paper clip on the book shelf
At the back of the classroom, look for a rose petal
Go to the cupboards, look for another paper clip in one of the bottles inside the cupboard
Used the 2 paper clips to open the cupboard and find a coat
After leon wore the coat, click the pocket to find a key.
Use the key on the door to go out.
Hallway
Go inside a room on the same level
Click on the rose petal
The mirror has 6 letters that are reversed, click on ‘d’ ‘r’ ‘e’ ‘a’ ‘t’ ‘h’ respectively
The drawer lock can be opened and you will find a seal
Basement
Go down the basement and find another rose petal on the second stone stand
On the other stone stand, insert the seal and arrange it to form a square
After that, click a white door.
Boss fight
Use the lighter on the roses on your left.
Click anywhere on the screen to stop the gauge and ensure that it stopped at the fire symbol
After 3 times of successful tries, the roses will be burnt
Old classroom
Optional – Find the sword and release the doll
Find a book on the floor and turned to the 3rd page

Here’s the answer.
-Enjoy the cutscene ending

