1. "I'm temporarily busy, and I'll come back later": This is a simple and clear advertisement, which expresses that you are temporarily busy and implies that you will come back in the near future.

2. "Leave briefly and come back later": This slogan conveys the short-lived nature of your departure and shows that you plan to come back in the near future.

3. "Please wait, there is something urgent to deal with": This slogan conveys the situation that you need to deal with urgent affairs, please ask others to wait until you come back.

4. "Leave temporarily, please leave a message or contact later": This slogan tells others that you can leave a message or contact later to express your hope to keep in touch.

5. "I'm very sorry to leave temporarily, please keep an eye on the update": This slogan expresses your apology for leaving temporarily because of something, and expresses the hope that others will keep an eye on the update at any time so as to understand your situation.

No matter which option you choose, make sure the slogan is concise, let others know that you have left temporarily and convey the message that you are looking forward to coming back as soon as possible.