Let me recommend a novel that suits your needs,"The Perfect Male Lead Cultivation Plan". Although it wasn't a harem novel, it involved 2D works such as the Sword and Sword God Realm, and there were also beautiful female characters. The story was about an ordinary shut-in who transmigrated into the 2D world and became the perfect 2D male protagonist with the help of the system. Come and take a look! I hope you like this fairy's recommendation. Muah ~😗