Quick Transmigration: I'm Just a Male Supporting Character, Why Does Everyone Love Me?

Shu Xian transmigrated into a book, becoming the villainous male supporting character who supplements the plot. Why does he have so many fans in every world despite being a villainous supporting character? It turns out the main system secretly replaced his character with a "charming heartthrob system." The second-generation system, 006, cries out: "It's not me! I'm innocent! It's clearly the host's own charm that attracts the main characters!" World One: The protagonist and his four suitors. The protagonist (the bottom) doesn't chase after the main character (the top), but follows him around calling him "brother, brother." The big star Jian Fang, ignoring the protagonist (the bottom), keeps his eyes on him, sending him merchandise and affectionately calling him "little fan." Why is the rumored fierce Gu Tingyuan so gentle with him? After finishing...