[Comprehensive British and American] Who Is Li Hua?

Someday. Tony Stark, who was studying armor in Avengers Tower, received a letter affectionately calling him "Tony". The letter sincerely expressed regret for his poor math performance, encouraged him, and clearly listed one, two, three, four, and five ways to improve his math scores. Tony, an outstanding graduate of MIT, one of the greatest scientists of this century, Stark:? ? ? One night. Batman is beating up bugs in the dark alleys of Gotham when he receives a letter. The letter affectionately called him "Bruce", sincerely expressed regret for his inability to control his emotions, listed one, two or three suggestions in a clear and logical manner, and wished him to make more friends. Bruce, the actor who controls his emotions, also has an alliance. Not many people know his true identity so far. Wayne:? ? ? Some gym. Captain America, who was punching sandbags, received a strange letter. The letter affectionately called him "Steve" and expressed regret that he did not understand history. He also warmly invited him to visit the Smithsonian Museum. Steve · Living Legends · History Book Museum Characters · World War II Heroes · Rogers:? ? ? It seems that they are not the only ones who have received the letter, there are also many people who have received letters from the same person. Because the signatures are all, Li Hua... And the grammar throughout the article is full of mistakes_(:з∠)_.. And growing flowers on the other side of the ocean... "Why is my English composition missing? I'm going to go (╯‵□′)╯┻━┻!" Lof has posted a copy before, so please respect yourself, thank you:)