I read it before the official English translation came out, and liked it a lot even then, and I greatly enjoyed my reread as the official English translation released. I've written five fanfics for it and have more planned (one I wrote after finishing my reread and plan to post today or tomorrow), am following the donghua, and have a ton of merch for it, so yeah, I like TGCF a lot XD It's a long story but worth it in my opinion, and I read long books often enough (for instance, TGCF is 244 chapters, but the book I'm reading right now, ORV, is 551, and 2Ha, which I'm also reading, is longer than that).
If you read in English, the English translation is also complete as of two days ago, so it's a good time to get into it. If you're still hesitant, I'd recommend watching the donghua, since by and large it's a very good adaptation, and that's what inspired me to finish the book in the first place. It's not my favorite of MXTX's works (that's SVSSS) but I love it all the same, and it's one of my favorite danmei. The characters are wonderful, it's funny and angsty, and it's a story that benefits from rereads, too. I wish you luck if you try it!
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If you read in English, the English translation is also complete as of two days ago, so it's a good time to get into it. If you're still hesitant, I'd recommend watching the donghua, since by and large it's a very good adaptation, and that's what inspired me to finish the book in the first place. It's not my favorite of MXTX's works (that's SVSSS) but I love it all the same, and it's one of my favorite danmei. The characters are wonderful, it's funny and angsty, and it's a story that benefits from rereads, too. I wish you luck if you try it!