Here are a few ideas, but be warned: lying to people for a long time may destroy trust and ultimately harm both you and your friends. If you are just playing a "trick" for a short period of time, be sure to be mentally prepared and be ready to face various consequences afterwards. 1. Spiritual practice or personal growth journey You can say: "I have been very touched by inner exploration and spiritual growth recently. I just happened to have an opportunity to retreat and practice. I need to cut off external interference for a period of time. Just think of it as me finding my true self. I will share it with everyone when I come back." This kind of rhetoric has a sense of mystery, which makes people feel that this is a rare life experience, but it is not specific. It is vague and difficult to ask. 2. High-end tasks or secret research projects You can say: "The company (or an institution) just asked me to participate in a very confidential and cutting-edge project. I am required to devote my full time for a few periods of time. During this period, I cannot accept external contacts. This project is of great significance to my career development. I will return after completion." This kind of rhetoric is quite like a movie plot. Friends often don't delve into the details, but be careful not to be too specific, otherwise it may attract too many questions. 3. Overseas study or artistic creation inspiration trip You can say: "I recently received an invitation from an overseas place to create/research in a place far away from the hustle and bustle, and it may be inconvenient to communicate for the time being. This is a rare opportunity and it means a lot to me personally." This statement not only reflects personal pursuit and growth, but also gives enough privacy space, and it is difficult for others to delve into the specific situation. 4. Health treatment or psychological adjustment If your friend cares about you, you can use "physical and mental adjustment" to say: "Recently, I feel a little tired physically and mentally. The doctor recommends that I take a period of thorough recuperation and conditioning, so I have to temporarily disconnect from the outside world and recover well. I will contact you again after I have adjusted myself." This excuse is easier to be understood in terms of human relations. Be careful not to make people think that you are really sick or too concerned. No matter which reason you choose, it is recommended to prepare some vague details that can withstand repeated questioning in advance, such as: "This trip is too rushed, and many specific arrangements cannot be disclosed for the time being", or "It involves some details that cannot be made public, I hope you understand." At the same time, it is best to set a reasonable "return date" so that when friends ask, there is an expectation and the situation will not become more and more complicated. Finally, please consider it carefully. Since your friends care about you, you can communicate your needs and space. I believe that maintaining transparent and honest communication will win more trust in the long run.