I, a Passerby, Became the Protagonist?

Curiosity killed the cat is—— Li Yun from Curious B Game has entered the game! The younger brother Li Yunyi, who became the heroine of the second game, is different from his sister who is surrounded by stars. As a younger brother, he is gloomy and lonely and has no friends. Li Yunyi: "..." But socializing is really troublesome, so he might as well continue to keep company with the second dimension. However, after the famous beauty of the sister got married, several other male protagonists in the game fell out of love. It wasn't until Li Yun, who had changed his hairstyle, appeared again and again that his true face was finally exposed to everyone. She has an appearance that is 80% similar to that of her beautiful sister. It is another kind of handsome appearance unique to men. At this moment, all the shortcomings have become nothing. Now the suitors who were heartbroken because their sister's famous beauty was married have a new goal. Although their genders are different, their siblings are one family, and they are the same people after all. Chased! -- The sunny and vigorous junior showed his fangs when he smiled. When the junior found that Li Yun, who no longer held his chest and was hunched over, had straightened his waist, he actually had to slightly raise his head to look up at Li Yunyi, the junior suddenly couldn't laugh... A second-year student in the same class, Yijiji, refused to give up even after his sister got married to a famous woman. He pulled Li Yunyi to give him advice. Li Yunyi was annoyed and casually complained: "My sister has a partner. If you are stalking her, you might as well consider switching to me." The idiot classmate's eyes suddenly lit up. Li Yunyi: "..." Do you believe what I'm telling you? When he entered university, he was drawn into a certain club at a loss. Li Yunyi found out that his sister was also in this club. The club president took good care of his sister, and when Li Yunyi came, he also took good care of him. But Li Yunyi wanted to say: "The president doesn't have to wipe my sweat, bring water, or bring breakfast for me. I can do it myself." Li Yunyi recalled memories that didn't exist at all, and couldn't figure out why the good male protagonists of the second game suddenly turned around and started attacking his brother with a background? He is a passerby, not the protagonist! Main attack! Determination: Stick to one goal and be firm in one's mind.