Honestly, even without the message, Shun Yin had no intention of joining the Assassins Guild. They sounded extremely shady, and their values and modus operandi were completely at odds with what he aimed to be.
A hero. An ally of justice. A hero did not go around assassinating people for money or sneaking around in the dark. A hero was someone who stood up against others, protect them from evil while being a symbol in the light, for all to see.
However, he thanked Michael after receiving the letter. Just to be sure, Shun Yin crumpled up and burned the letter with a basic fire spell, erasing all traces of it ever existing. Michael expressed his agreement.
"Do you have any idea how to search for Angelica?"
"If I did, we would have found her long ago, don't you think?" Michael was trying his best not to let his frustration show in his voice.