She didn't know; she had simply read too many novels and watched too many TV dramas. She thought that if rich young ladies were having someone watch others, there must naturally be a reason—not just for the sake of watching. Such surveillance would undoubtedly yield some evidence; therefore, she subconsciously asked the question, never expecting that He Yiran indeed had some. "But I'm also very curious why you're still watching her. Even if you think there's something off about her, it shouldn't warrant this level of surveillance, right?"
Most importantly, Yu Duoduo's appearance shouldn't pose any threat to He Yiran and could even be seen as nothing more than a passerby.