I Send Warmth to the Other World, and the Other World Sends Me Banknotes

Lin Xingye inherited a door from his crazy uncle. This side of the door: 9-dollar items, lighters, antibiotics. On the other side of the door: a magic crystal core, a plant that can talk, and a medicine that can cure my sister. He originally wanted to be a happy businessman, making money, paying off debts, and saving his sister. Until trouble gradually comes to the door.