You are so lucky to have a very kind boss, Loan. Really sorry to hear that he had to give up his own business. It must be really hard for him.
My current boss is very much like your boss. He treats me like his family. On the days I went to get the covid vaccine jabs, he texted to make sure I am ok. When I was away for a holiday, he also texted me to ask if everything went well and if I have fun. He invited me and my partner for christmas dinners at his home every year as he knows we dont have family around. So I understand how you felt when saying goodbye to a kind and generous boss.
You are also lucky to have such a kind boss. We need to cherish those good relationships, right? Thank you for reading my post, @Dora. Good luck always smiling at you.😉