What's the big deal with memory kill?

Mu Yuan and mother mu video-called for half an hour. For the entire 20 minutes, he was describing what kind of beauty a beauty was. He used all the idioms that could be used in ancient poems, such as sinking fish, falling geese, shutting the moon, and embarrassing flowers. He even bragged about being able to fly, dive into the water, and fight a Tiger. At first, he even praised her like she was a beauty, but the more mother mu listened, the more she felt that something was not right. This beauty sounded very violent, very strong, and seemed to be very good at fighting.

Later on, she thought that her son was going for training, so he must be a female secret agent.