Hogwarts: Time and Jade

Nineteen years after the famous Harry Potter defeated the Dark Lord. An orphan from a wizarding family received a letter from Hogwarts. He could be considered an orphan. His father left his mother when she was pregnant, leaving only a piece of jade and a pendant that looked like an hourglass. When she was six years old, her mother died of illness after searching for her husband to no avail. I thought I would end my happy seven-year student career and find a job that interests me and simply end my life. Little did I know that my life experience and that pendant would involve me in a shocking conspiracy! Phoenix Prewett Lee has powerful talents and a mature and calm mind. Let's see how he solves problems and overthrows the evil organization with his friends! But what is the unknown story behind the whole thing?