Addendum: Japanese is definitely hard. Sure, Hiragana and Katakana can be quite easy (don't talk to me about subject-verb agreement, I still am not in that level), but then came Kanji.
I'm not sure which between Chinese or Kanji is a harder prospect to have. Nonetheless, I'm just slowly learning from listening to Japanese subs in playing Yu-Gi-Oh! Tag Force games. Don't give me Kanji memes, please
For me the hardest part would be the writing. I don't even want to imagine how many years it would take to learn those languages.
Learning it itself could be one entertaining source, however. Reminds me of some Japanese dude named Ritomo who shares how Kanji letters came to be, and you might not want to check how 心 (heart) originated. But I understand: it would definitely take years as well, and ya know— I'm forgetful, so of course I could barely reach N3 this way BAHAHAHHA.