"This is just a room with sundries. It has always been locked. My mother never let us come near. I suspect that there is a problem inside." Yun Ruoyue said.

Linger nodded in agreement, "Well, but we don't have the key and can't open the lock, what should I do?"

"I have a way." After Yun Ruoyue finished speaking, she took a bottle of magic acid from the medical system as soon as she moved her consciousness.

This magic acid, like aqua regia, can corrode things.

But its effect is one hundred times that of aqua regia.

It is a chemical substance. They used it when they were researching drugs, so they had it in the hospital.

This magic acid is a highly corrosive solution. When its concentration is particularly strong, it will be very corrosive and can corrode any substance such as gold, silver and iron, but it only reacts to alloy compounds, not to proteins.

In other words, this magic acid can corrode spoons, iron locks, and the like, but it won't corrode the flesh or harm the human body.

Therefore, Yun Ruoyue was relieved to take a small bottle of magic acid from the cold storage of the medical system.

When Ling'er and Jiu'er saw the bottle of magic acid, they both looked confused, "Sister, what are you? Why haven't I seen it?"

"This is magic acid. It's a potion that corrodes gold, silver and iron. Look at it." After Yun Ruoyue finished speaking, she opened the magic acid and poured a little on the handle of the iron lock. In an instant, the lock handle was slowly corroded.

In less than twenty seconds, the lock was corroded and broken, and Yun Ruoyue pulled the lock down with her hand.

Ling'er and Jiu'er looked surprised at this scene.

"Sister, this magic acid is too powerful, you are so powerful, you broke the lock in one fell swoop, let's go in and take a look." Ling'er said.

Yun Ruoyue nodded, threw the lock to the ground, then gently opened the door and looked into the room.

But after she opened the door, she only saw tables and benches with broken legs piled up all over the room, and some old furniture, which was covered with dust, and there were spider webs everywhere in the corners. It seemed that nobody lived. Utility room.

Ling'er and Jiu'er also came over, and when they saw these debris, they were also taken aback.

"Sister, why are there only debris and nothing? But I really heard the sound last time. Could it be that the ghost will come out at night?" Ling'er said with a look of horror.

At this moment, there was an anxious slap on the wall on the opposite wall, and there was a cry of panic in a hurry. The shout was vague, babble, and it was a female voice.

The sound of the door shot was accompanied by the sound of chains colliding. The sound was rattling, and there was a cold echo, which was very crippling.

Ling'er was so scared that she hugged Yun Ruoyue tightly, "Sister, did you hear it? It's this voice, it's so terrible, where did it come from? There will be no ghosts in this big day, right?"

Yun Ruoyue was also taken aback by the sound. She realized that the sound was coming from the opposite wall, so she clenched the stick in her hand and boldly walked towards the wall step by step.

As she walked, she courageously asked, "Who is inside? Is it a person or someone pretending to be a ghost? Come out for me!"

She really doesn't believe that there are ghosts in this world.

Who knew that as soon as she finished speaking, the banging sound became more anxious and violent, like a reminder.

The sound of the door clattering with the sound of chains, clanging, made their hairs frightened.