You Fool! My Genius Childhood Friend Has Been Secretly in Love with Me! Bad Ending

Content warning: tragic ending [Sunny, cheerful unlucky bottom × cold, taciturn top student] [Both protagonists are adults; no underage romance.] Wen Cheng has been in an awful mood lately, worse than dropping his phone in the toilet, choking on water, or getting hit by a ball while walking past. His childhood friend is actually starting to avoid him!? So Wen Cheng decides he's going to hate his childhood friend. Except he has no backbone. His childhood friend waves, and he comes hurrying right back. He even ends up offering himself, too. (How infuriating!) - Xie Qingshu has fallen for his childhood friend and decides to keep his distance so he won't give himself away. But how can this childhood friend be so good at romance?! Birthday surprises, with flowers every time. And though he's clumsy, he even gives him a bouquet of wooden flowers he carved himself. Because wooden flowers never wither. * Everyone knows Xie Qingshu has a cat that no one is allowed to touch. The cat isn't friendly at all. The reason: it's afraid its owner will get angry. But no one has ever seen the cat's other owner. They've only seen a person and a cat watching over a little orange tree. - Every bit of longing that spills over says, “I miss you.” Sun & Moon