Maybe it's the exaggerated expressions and reactions of the sister or the comical situations she finds herself in. Also, the contrast between her annoying behavior and the humorous outcomes can add to the fun.
It could be the sister's crazy antics or her unique way of getting into trouble that makes it funny.
It could be her constantly getting in the way or being mean for no good reason.
An annoying cat cartoon could be annoying because of repetitive actions, a shrill voice, or a storyline that doesn't make much sense. Sometimes, it's just a matter of personal preference and what one finds irritating.
Well, for an annoying funny comic to be successful, it often needs unique characters and a fresh perspective. The annoyance has to be funny in a way that catches people's attention without being too over the top. Also, the storylines and gags need to be unpredictable to keep readers engaged.
You could try showing her kindness and patience. Maybe give her a toy or play a game with her to distract her.
Maybe it has poor animation quality or a repetitive storyline. That can make it annoying for viewers.
Well, maybe it's the way the cat gets into mischief but has those big, adorable eyes. That could make it both annoying and cute.
Perhaps it's their disobedience. They never listen to the adults or follow the rules in the story. This causes chaos and trouble for the other characters. For instance, if they are told not to touch something precious and they do it anyway just out of defiance.
Maybe it's the repetitive plot or unlikable characters. Some manhwas can get annoying when these elements are not handled well.
Maybe it's popular because it has relatable characters and an interesting plot. People can easily get hooked on the story.
Well, an annoying sister in GL manhwa might be overly bossy, constantly interfering in the main characters' relationship, or just having a generally negative attitude.