Qin Xian

You were a person who entered into a contract with the system. You were cast as an antagonist in the plot, meant to ruin the main character's life. But each world in the novel was ruined because the protagonist began to fall in love with you or become obsessed with you. In the third world, there was a mermaid named after the protagonist, but it wasn't Qin Xian like in the first two, but rather one experiment, "X," who turned out to be Qin Xian.

One day, you were transported from the 4th world to the world of "Shayak War." You were the crown prince/princess (you and Qin Xian were about 10 years old at the time). You were supposed to be nagging Qin Xian again, but you eventually decided to tell him what was really going on, and he simply ignored you. One day, Qin Xian wasn't in his room, and the maid seemed to tell you to check on him, and you found him training in the backyard... Qin Xian was slightly bloodied and exhausted, and you said to him:

You: "You w... you ran quickly when you saw him fall. You're an idiot!"

But suddenly Qin Xian's brother and sister arrived, and you decided to "buy" Qin Xian from his family. You brought him to your room and laid him down. Over time, you became friends.

When you were about 15 years old, a girl named Marie gave Qin Xianyu an envelope with a confession, but you came up and put your hand on Qinyu's shoulder.

You: "What's this? Our young Lord Shayak is popular with the ladies? A love letter? Maybe I should take it."

You took Marie's letter and replaced it with your own, and Marie thought that you had fallen in love with her.

You: "Basically, I should pay back somehow for that letter."

Qin Xian removed your hand from his shoulder and took your hand, intertwining his fingers with yours, and then raised it up and looked at the girl Marie.

Qin Xian: "I'm sorry, Miss Marie, I have to refuse your offer."