How long do you think it will take China to fight North Korea?

Two months? Let's stick to the level of World War II. Is it valuable to occupy and attack a large part of North Korea? If there is a conflict of interest, withdraw after the fight. Information warfare can capture the whole territory of China within one week without interfering with the delivery ability of troops, and begin to withdraw troops within three months after supporting the puppet regime. Moreover, before the war, satellites will be used to lock each other's strategic and long-range strike weapons and then destroy them. China's attack on North Korea must be crushed by science and technology, and it would be nice if one twentieth of the long-range weapons hit China.