Wanting to break Mo Lian out of the loop, and actually doing it, are two completely different things, as Lan Tian soon finds.
If he stands directly in front of her, shouting, she just moves out of the way as if he isn't there.
She notices changes in her environment and reacts to them, as he finds out after moving the corpse of her lover away from the table and pulling the curtain away.
That makes her notice the body as soon as she walks into the room, but the only result is shortening the loop, not ending it.
After trying to get her attention for the third time, Lan Tian is ready to give up.
It's then that he has an idea.
If she notices changes in her environment. He can use that to his favour.
He takes the journal from the desk, and runs after her when she next leaves the room.
On her next course through the jade hallway he leaves the journal in her path, where she will be able to find it easily.