The most unlucky thing is that the time travel started right after graduation. It was not Harry Potter, Death, Saint Seiya, or even the simplest Grimm fairy tale, but the animated version of Mr. Bean. Of course, it's not Mr. Bean who travels through time, but the Teddy in Mr. Bean's hand.
Teddy said: Hello Mr. Bean, Goodbye Mr. Bean!
Ps: The primary school student author Han Dou has not finished watching it yet and has only watched a few episodes with his younger brother. Please forgive me if there is any OOC.