Fantasy: Why Is My Senior Brother so Evil?

Li Yan was raised by his master since he was a child. He awakened the system three years ago. He only needs to do some ordinary things every day to become stronger. One day, the master suddenly went out and invited several junior sisters to him. However, these junior sisters are all geniuses, but the only thing they have in common is that they do not have any skill points. With his master away, Li Yan really had no choice but to use his own method to teach chaos. However, what I never expected was... He casually wrote a sword formula, and the second junior sister actually understood the peerless sword intention! He casually wrote an elixir recipe, and the third junior sister actually caused endless elixir disaster! He casually drew a circle on the ground, and the fourth junior sister actually understood the world-destroying magic circle! Li Yan: "???" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.