What Does It Mean to Leave This Secret Book Behind When Your Parents Run Away?

Li Mo, a social worker, worked overtime until he collapsed, but received a message from his parents: "Son, we have achieved great success. We will go to the end of the world to fight swords first. See you in the future!" He was left with only "the secret book" and a head full of questions. When he asked the customer service in a trembling voice, "Is this technique... Is it serious?", He received a reply: "Dear, all the secrets in our store support official verification!" It wasn't until he killed the martial arts master who came to find trouble and looked at the "travel diary" sent by his parents from time to time that he realized that he already held the "key" and stood at the junction of the two worlds. Wait, why is the CEO of the listed company who cured Lao Han's legs with his "transformed zhenqi" crying and clamoring to hire him as the chief health consultant?